Changes

M41

6,334 bytes removed, 02:28, 24 June 2025

Further overhaul

!Year

!Event

~~!Source~~

|-

|701.M41

|[[Corinth Crusade]]: the [[Liberation of Slaughterhouse III]].{{Fn|2i}}

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|-

|703.M41

|[[Erasmus Haarlock]] vanishes after wiping out his entire family.{{Fn|9j}}

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|-

|704.M41

|The Siege of [[Tulwa]]: [[Marneus Calgar]] leads infiltration force that destroy the [[Fortress of Pain]] ([[Iron Warriors]]).{{CME}}

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|-

|710.M41

|A Mechanicus tribunal declares [[Magos Biologis]] [[Sar Resque]] [[heretek]] and Excommunicate for deliberately releasing a mutation-plague upon Outpost 1253.{{Fn|~~[[Dark Heresy: Creatures Anathema]], pg. 11~~36}}

|-

|712.M41

|[[Magdelon Incursion]]{{Fn|8b}}

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|-

|rowspan=2|718.M41

|[[Roodmar Urussalin]], last of his [[rogue trader]] line, is presumed slain by [[ork]]s.{{Fn|9j}}

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|-

|The [[Inquisition]] discovers that the Sinners' Plagues in the [[Drusus Marches]] are the work of [[heretek]] [[Magos Biologis]] [[Sar Resque]].{{Fn|~~[[Dark Heresy: Creatures Anathema]], pg. 11~~36}}

|-

|721.M41

|[[Corsair Prince]] [[Nhilus|Nhilus the Ardent]] and his raiding [[Eldar Corsairs]] army are defeated by the [[Angels Sanguine]] [[Chapter]]{{Fn|8b}}

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|-

|722.M41

|The last group of [[heretek]] [[Magos Biologis]] [[Sar Resque]]'s followers are destroyed along with the colony hive of Teruxyne. Resque remains at large.{{Fn|~~[[Dark Heresy: Creatures Anathema]], pg. 11~~36}}

|-

|731.M41

|Commander [[Puretide]] is crippled in battle while touring the [[Damocles Gulf]] colonies. He retires to Mount Kan'ji on [[Dal'yth]], mentoring exceptional Fire Caste initiates. After his death, the Earth Caste creates an AI hologram so his wisdom can reach further generations.{{Fn|29b}}

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|-

|733.M41

|The decade-long [[Arkunasha War]] begins. Commander [[O'Shovah|Farsight]] is active during the war.{{Fn|29c}}

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|-

|737.M41

|[[Valos]] reported stripped of life, later revealed to be the work of [[Hive Fleet Behemoth]].{{CME}}

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|-

|738.M41

|[[26th Founding]].{{Fn|~~[[Warhammer 40,000 Compendium]], pg. 6~~37}}

|-

|739.M41

|[[Wolf Lord]] [[Finn Goresson]] boards the gargantuan [[Ork]] warship ''Starkrusha'', with a small force of [[Space Wolves]]. Six months later, he emerges from the ship with [[Warboss]] [[Godstompa]]'s head hanging from his belt.{{Fn|~~[[Codex: Space Wolves (5th Edition)]], pg. 18~~38a}}

|-

|740.M41

|The [[Exorcists]] Chapter save the planet of [[Stonekraal]] from a large [[Genestealer]] infestation.{{Fn|13e}}

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|-

|740-743.M41

|The [[Balance Wars]] take place.~~|[[The Sabbat Worlds Crusade (Background Book)]]~~{{~~CME~~Fn|1}}

|-

|rowspan=3|741.M41

|[[Inquisitor]] Bastalek Grim attends the Great Feast of [[Wolf Lord]] [[Gerrod Redbeard]], committing the sagas recounted there to his eidetic implants. From these he creates Imperial records later titled "The War of the Giants."{{Fn|~~[[Codex: Space Wolves (5th Edition)]], pg. 18~~38a}}

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|Following a costly victory over [[Imperium|Imperial]] [[Titan Legion]]s on Malaxis, the [[Autarch]]s of the five largest [[eldar]] [[craftworlds]] convene. They decide that the lesser races must be shown their place; their message spreads across the craftworlds, resulting in the largest recruitment of eldar taking the Path of the Warrior in millennia. Many civilian paths are abandoned as a result.{{Fn|~~[[Codex: Eldar (6th Edition)]], pg. 22~~39}}

|-

|Thulean datavaults recovered from Dolorium's voids at this time describe star systems beyond the [[Koronus Expanse]].{{Fn|9e}}

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|-

|742.M41

|The [[Imperium]] of Man launches the [[Damocles Crusade]] against the [[Tau Empire]]. The Tau first deploy [[Onager Gauntlet]] technology against Imperial armour. A truce is agreed upon and Imperial forces are redeployed against the approaching [[Hive Fleet Behemoth]]. Due to a lack of transports, several regiments of the [[Imperial Guard]] are left behind. First Imperial contact with [[Kroot]]. The Tau Empire's [[Second Sphere of Expansion]] ends.{{Fn|29c}}{{Fn|29d}}{{Fn|~~[[Codex: Space Marines (4th Edition)]], pg. 20; [[Codex: Tau (3rd Edition)]], pg. 58~~40a}}{{Fn|41}}

|-

|rowspan=3|744.M41

|[[Taggarath]], Seer of [[Corrinto]], foresees the approach of the [[Time of Ending|End Times]], and prophesies a time of unprecedented upheaval, in which even the light of the [[Emperor]] is swallowed in darkness. Taggarath is immediately executed for heresy, but his prophecy still spreads in whispers.{{Fn|14b}}{{Fn|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 126~~42a}}

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|A string of murders and thefts at the Kellerman Scholam on [[Amarah]] are linked to a Cult Celestarii plot regarding xenos artefacts. A gun battle between cultists and [[Adeptus Arbites]] leaves the Scholam a smoking ruin. Witnesses report seeing a fire-shrouded figure retrieve several artefacts from the burning complex, untouched by the fire. Forensic examinations do not establish which of the Scholam's collection of xenos artefacts were stolen before the fire destroyed the rest.{{Fn|32b}}

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|-

|The [[Silent King]] ends his self-imposed exile and returned to the galaxy after encountering the [[Tyranid]]s within the intergalactic void and realising the threat they pose. He has begun a journey across the galaxy with a band of his loyal [[Triarch Praetorian]]s to reawaken Tomb Worlds that still slumber so they may unite against the Tyranids.{{Fn|~~[[Codex: Necrons (5th Edition)]], pg. 24~~43c}}

|-

|rowspan=3|745.M41

|The [[Fall of Tyran]], the battle that marked the first major encounter between the Human species and the alien [[Hive Fleet]]s. Inquisitor [[Kryptman]] would eventually investigate the incident and designate the new threat as the Tyranids.{{Fn|~~[[Codex: Tyranids (5th Edition)]], pgs. 8-9~~44a}}

|-

|The [[First Tyrannic War]]. [[Hive Fleet Behemoth]] attacks the Ultramarines' homeworld of [[Macragge]]. At the [[Battle for Macragge]], the [[Tyranids]] are defeated, but only at great cost - the entire [[First Company]] is wiped out, and the 3rd and 7th [[Space Marine Company|Companies]] suffer horrific casualties.{{Fn|~~[[Codex: Tyranids (5th Edition)]], pgs. 10-11~~44b}}

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|[[Aun'Va]] makes the decision to place Commander [[Puretide]]'s favoured pupils (including [[O'Shaserra]]) into stasis, allowing them to be recalled when needed in the future.{{Fn|29c}}

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|-

|rowspan=2|746.M41

|The [[Sons of Guilliman]] purge [[Nova Terra]] of [[genestealer]]s, executing the entire ruling class in the process. Sergeant [[Constantinus]] declares he will lead the sector into a better age, seceding it from the Imperium. The bloody unrest attracts the attention of the Ruinous Powers. The [[Officio Assassinorum]] has Constantinus killed to end the rebellion.{{Fn|25a}}

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|-

|[[Rogue trader]] Wrath Umboldt discovers the Processional of the Damned and glimpses the Alenic Depths.{{Fn|9j}}

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|-

|748.M41

|The [[Blood Star Campaign]].{{Fn|26b}}

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|749.M41

|The 812th [[Feast of Blades]] is held, with all twelve of the competing [[Space Marine]] [[chapter]]s in attendance. [[Hervald Strom]] of the [[Iron Knights]] is victorious.{{Fn|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~3f}}

|-

|rowspan=2|750.M41

|The [[Red Wolves]] [[Space Marines]], unsupported, prevent the [[Night Lords]] [[Chaos Space Marines]] from acquiring the possessed cruiser ''[[Shadeblight]]''.{{Fn|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~3f}}

|-

|The [[Great Exodus]]. After mysterious activity in the [[Argos System]] involving six [[Eldar]] [[Craftworld]]s, every primary star within sixty light years is extinguished. Nearly 12% of the Imperial population and 32% of the heavy industry is successfully evacuated. The ring of dead planets becomes a salvager's paradise and is now known as the [[Deadhenge]].{{Fn|26b}}

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|-

|752-754.M41

|The [[Khulan Wars]] take place.~~|[[The Sabbat Worlds Crusade (Background Book)]]~~{{~~CME~~Fn|1}}

|-

|754.M41

|The Harvest of Reavers: [[Aspyce Chorda]] has the surviving pirates of Iniquity lobotomized and used as slave-serfs.{{Fn|9i}}

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|754-756.M41

|The [[Salamanders]] Chapter purge the [[Moons of Ymgarl]] of [[Genestealers]]. [[Space Marine Captain|Captain]] [[Sokhar Bray'arth]] of the 4th Company is interred in the [[Iron Dragon]] [[Dreadnought]] chassis after suffering mortal wounds.{{Fn|13a}}{{Fn|13f}}{{Fn|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~3f}}

|-

|755.M41

|The [[Sabbat Worlds Crusade]], the largest Imperial offensive since the [[Macharian Crusade]], begins. {{Fn|~~[[Codex: Imperial Guard (5th Edition)]], pg. 22~~45a}}

|-

|757.M41

|First recorded incidence of the [[Zombie Plague]]. Twenty-three billion healthy Imperial citizens of [[Hydra Minoris]] are quarantined.{{Fn|25a}}{{Fn|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 126~~42a}}

|-

|759.M41

|[[Scouring of Quintarn]]: [[Marneus Calgar]] commands forces against [[Ork]] scavengers who captured the triple system of [[Quintarn]], [[Tarentus]] and [[Masali]] (part of the [[Ultramar]] Coalition) in the aftermath of the Battle for Macragge.{{CME}}

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|-

|rowspan=2|760.M41

|The [[Minotaurs]] Chapter breaks the [[Siege of Casaubon]].{{Fn|13c}}

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|Commander [[O'Shovah|Farsight]] recaptures much of the territory the [[Tau Empire]] lost in the [[Damocles Gulf Crusade]] but refuses the recall order. He establishes the fortified [[Farsight Enclaves]].{{Fn|29c}}

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|-

|rowspan=3|762.M41

|[[Marneus Calgar]] leads the [[Ultramarines]] against the [[Daemon]]-corrupted [[Forge World]] of [[Thrax (Forge World)|Thrax]]. After retrieving crucial data-records from the manufactorums, banishing thousands of daemons in the process, Calgar withdraws his forces and pronounces [[Exterminatus]] on the planet.{{Fn|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~3d}}

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|The [[Catachan MXIV|Catachan MXIV 'Unseen Lurkers']], led by [[Colonel]] [[Black|'Steel Eye' Black]] engage [[Ork]]s of the [[Death Skulls]] on the planet of [[Kato]], a [[shadow world]]. The stalemate is only broken once [[Imperial Guard Sentinel|Sentinel]]s locate and destroy the Ork [[Stompa]] factory hidden in Widow Valley.{{Fn|~~[[Codex: Imperial Guard (5th Edition)]], pg. 22~~45a}}

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|Purging of [[Gladrinus VI]]{{Fn|8b}}

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|-

|rowspan=2|765.M41

|[[Space Marine]] [[Chapter]] Losses to date: 13 lost in the [[Warp]], 21 Irrecoverable battle losses, 9 [[Geneseed]] failure, 4 Inquisitorial purges, 16 Other circumstances.{{Fn|~~[[Codex: Space Marines (3rd Edition)]], pg. 47~~46c}}

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|[[Warmaster]] [[Slaydo]] killed on the planet [[Balhaut]].~~|[[The Sabbat Worlds Crusade (Background Book)]]~~{{~~CME~~Fn|1}}

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|rowspan=3|766.M41

|[[Prince Yriel]]'s [[Eldar]] pirates attack several Imperial listening posts in the [[Catachan]] and [[Ryza]] systems. Without their early warning 'eys and ears', this leaves both systems vulnerable for decades to come.{{Fn|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 126~~42a}}

|-

|[[Twelfth Army]] is diverted from the [[Second Kholdas War]] to put down a rebellion on [[Danik's World]].{{Fn|~~[[Rebel Winter (Novel)]], ''Hammer and Shield''~~47}}

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|The Chartist freighter ''[[Manticore Agirus]]'' suffers a failure of its Geller field during transit from [[Arcantis]] to [[Ribasu]]. The screams of its crew and three thousand passengers echo through the Capitoline sub-sector's Warp signature for decades.{{Fn|32b}}

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|-

|769.M41

|Defence of [[Vervunhive]], planet [[Verghast]].{{Fn|33x}}

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|rowspan=2|771.M41

|The [[Tanith First and Only]] defend the [[Shrinehold of Saint Sabbat]] on [[Hagia]].~~|[[Honour Guard (Novel)]]~~{{~~CME~~Fn|48}}

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|The [[Tanith First and Only]] assist with the liberation of [[Phantine (Planet)|Phantine]].{{Fn|~~[[The Guns of Tanith (Novel)]], Prologue~~49}}

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|rowspan=2|772.M41

|[[He'stan Vulkan]], [[Forgefather]] of the [[Salamanders]], recovers the [[Gauntlet of the Forge]] after defeating the [[Eldar]] pirate lord [[Iath Bloodweaver]].{{Fn|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~3f}}

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|The [[Tanith First and Only]] see action in the stalemated trench war on [[Aexe Cardinal]].~~|[[Straight Silver (Novel)]]~~{{~~CME~~Fn|50}}

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|rowspan=3|773.M41

|[[Brazen Skulls]] are listed as extinct.{{CME}}

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|-

|The [[Tanith First and Only]] aid the reincarnated [[Saint Sabbat]] on [[Herodor]].~~|[[Sabbat Martyr (Novel)]]~~{{~~CME~~Fn|51}}

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|Air war rages on [[Enothis]] between Imperial and Chaos pilots.~~|[[Double Eagle (Novel)]]~~{{~~CME~~Fn|52}}

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|774.M41

|[[Gereon]] Mission, [[Sabbat Worlds Crusade]]~~|[[Traitor General (Novel)~~]]{{~~CME~~Fn|53}}

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|775-777.M41

|[[Sulsalid Campaign]], [[Fourth Quadrant rebellion]].{{Fn|2g}}

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|776.M41

|Step-cities campaign on [[Ancreon Sextus]] concludes.~~|[[His Last Command (Novel)]]~~{{~~CME~~Fn|54}}

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|rowspan=2|777.M41

|[[Chaos Space Marines]] led by the [[Black Legion]] break out of the [[Cadian Gate]], only to be slowed by the [[Cadian]]s and are eventually driven back with the help of the [[Imperial Fists]].{{Fn|~~[[Codex: Imperial Guard (5th Edition)]], pg. 22; [[Codex: Space Marines (5th Edition)]], pg. 49~~3f}}{{Fn|45a}}

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|[[Gereon]] liberated by Sabbat Crusade forces.~~|[[The Armour of Contempt (Novel)]]~~{{~~CME~~Fn|55}}

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|rowspan=2|778.M41

|General [[Andreas Carnhide]], a veteran [[Imperial Guard]] commander, draws together feuding factions of Guard, Navy, and [[Adeptus Mechanicus]] to retake the hive world of [[Lyubov]] from the forces of Chaos, including warriors of the [[Blood Pact]].~~|[[Tactica Imperialis]]~~{{~~CME~~Fn|56}}

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|The [[Tanith First and Only]] fight on the fortress-world of [[Jago]].~~|[[Only in Death (Novel)]]~~{{~~CME~~Fn|57}}

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|rowspan=2|780.M41

|[[Lycanthos Drift Campaign]], [[Fourth Quadrant rebellion]].{{Fn|21a}}{{Fn|2e}}

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|[[Blood Pact]] infiltrators attempt assassination of [[Mabbon]] Etogaur on [[Balhaut]].~~|[[Blood Pact (Novel)]]~~{{~~CME~~Fn|58}}

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|rowspan=2|781.M41

|[[Wolf Lord]] [[Osric Three-Fists]]'s fleet is ambushed in the [[Maelstrom]] by a larger [[Chaos]] fleet. When his flagship is crippled, Osric leads the remains of his [[Great Company]] in a boarding action of the Chaos flagship ''[[Storm of Hate]]''. Only thirty [[Space Wolves]] board the ship, but manage to capture the ship and turn its firepower on the rest of the Chaos fleet.{{Fn|~~[[Codex: Space Wolves (5th Edition)]], pg. 18~~38a}}

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|[[Tanith First and Only]] raid [[Salvation's Reach]].~~|[[Salvation's Reach (Novel)]]~~{{~~CME~~Fn|59}}

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|783.M41

|[[Battle of Maedrax]]. [[Eldrad Ulthran]] of [[Ulthwé]] foresees an Imperial explorer force would awaken the [[Necron]] tomb world. The [[Eldar]] destroy the explorer fleet and then the Necron complex. When leaving Maedrax, they have to fight their way through a relief force of [[Blood Angels]] [[Space Marines]]. Unfortunately, the Necron [[dynasty]] is much larger than Eldrad believed; tomb worlds across the system awaken.{{Fn|~~[[White Dwarf 342 (US)]], pg. 33 — ''"Timeline"'' ; [[Codex: Eldar (6th Edition)]], pg. 22~~39}}{{Fn|60a}}

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|784.M41

|[[Synod]] of [[Segmentum Obscurus]] declares the [[Margin Crusade]].{{Fn|12b}}

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|785.M41

|[[Aspyce Chorda]] goes to war with [[Calligos Winterscale]] over resources.{{Fn|9i}}

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|786.M41

|[[Eliac Zephyrblade]] of [[Saim-Hann]] delivers an ultimatum to the [[Imperium|Imperial]] colony on [[Gnosis Prime]]: evacuate or die. The colonists refuse and Zephyrblade leads his warhost against them. Despite being outnumbered one hundred to one, the warhost destroys the colony's military and industrial infrastructure before leaving the colony to their [[Dark Eldar]] allies.{{Fn|39}}{{Fn|~~[[Codex: Eldar (6th Edition)]], pg. 22; [[Planetstrike]] pgs. 60-~~61}}

|-

|790.M41

|The [[Vostroyan Firstborn|Vostroyan IX]] under [[Graf Toshenko]] are wiped out defending the factory city of Polia on the planet of [[Nimbosa]] from the Tau Commander Brightsword, inspiring the populace to resist the Tau's culture of 'the Greater Good'.{{Fn|~~[[Codex: Imperial Guard (5th Edition)]], pg. 22~~45a}}

|-

|791.M41

|Imperial forces begin liberation of [[Urdesh]].~~|[[The Warmaster (Novel)]]~~{{~~CME~~Fn|62}}

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|792.M41

|[[Urdesh]] liberated and [[Anakwanar Sek]] slain.~~|[[The Anarch (Novel)]]~~{{~~CME~~Fn|63}}

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|794.M41

|The Faceless Lord [[Karrad Vall]] braves the Maw to shell [[Footfall]] and battle [[Calligos Winterscale]]. His fleet tears through the defences and he leaves taunting messages before he disappears for a decade.{{Fn|9g}}

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|-

|795.M41

|The [[Cadian 23rd]] put down an [[Krandor Rebellion|uprising]] in the [[Krandor System]].{{Fn|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 126~~42a}}

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|796.M41

|[[Adinbur Prime]]: Patrol group Tiryns assaulted by [[Necron]] [[escort]]s, but escape.{{Fn|35b}}

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|-

|797.M41

|The [[Siege of Zalathras]]: [[Marneus Calgar]] of the [[Ultramarines]] holds the gate alone against an invasion of [[Orks]] for a night and a day.{{Fn|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~3d}}

|-

|ca. 798.M41

|The [[Siege of Somonor]]: [[Eldar]] [[Farseer]] [[Eldorath Starbane]] attacks [[Somonor]]. [[Necron Overlord]] [[Szaron]] of the [[Arrynmarok Dynasty]] swears allegiance to [[Imotekh]], becoming a client of the [[Sautekh Dynasty]]. Imotekh repulses Starbane's attack, allowing him to flee back to [[Alaitoc]] after severing his right hand.{{Fn|~~[[Codex: Necrons (5th Edition)]], pgs. 13 & 22~~43a}}{{Fn|43b}}

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|rowspan=2|799.M41

|The [[Ultramarines]] begin to fortify the eastern bounds of [[Ultramar]] against the [[Tau Empire]].{{Fn|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~3d}}

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|The [[San Leor Massacre]]. The [[Red Corsairs]] attack [[San Leor]]. Nine [[Orders Militant]] of the [[Adepta Sororitas]] launch a counter-attack to defend the Sisterhood's original homeworld and annihilate the attackers.

{{Fn|Conflicting sources}}''The Red Corsairs were not formed until after the [[Badab War]], over one hundred years after 799.M41''~~|[[Codex: Sisters of Battle (5th Edition)]]~~{{~~CME~~Fn|64}}

|}

|[[Codex: Eldar (3rd Edition)]]{{CME}}

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|The [[Astronomican]] flickers, resulting in thousands of ships being lost in the [[Warp]].{{Fn|42b}}{{Fn|60b}}|~~[[White Dwarf 343 (UK)|White Dwarf 342 (US)]], pg. 33 — ''"Timeline"''; [[Warhammer 40,000 5th Edition Rulebook]], pg. 127~~

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|[[Hive Fleet]] [[Naga]] enters the galaxy from the [[Eastern Fringe]].{{Fn|44c}}|~~[[Codex: Tyranids (5th Edition)]], pgs. 16–17~~

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|[[Judgement of Hellenus]]{{Fn|8c}}

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|805.M41

|[[Marneus Calgar]] leads three [[Ultramarines]] companies against [[Waaagh! Gutshredda]] in the [[Forgoil]] system. In only three weeks, the Ultramarines halt the Waaagh! by destroying the Orks' [[tellyporta]] ships and [[Stompa]] factories. Calgar personally leads a [[Terminator Squad]] in a boarding action of Gutshredda's flagship, ''Da Superdestructa''.{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~

|-

|806.M41

|-

|807.M41

|[[Purgation of Jhanna]]: [[Marneus Calgar]] leads two [[Ultramarines]] companies in the recapture of rebellious oceanic cities of [[Omon]] and [[Vorlencia]] against renegades and [[Chaos Space Marines]].{{Fn|46a}}|~~[[Codex: Space Marines (3rd Edition)]], pg. 36~~

|-

|674.810.M41

|-

|rowspan=3|811.M41

|[[Dark Eldar]] raiders mount occasional but highly damaging raids on the main habitation area of [[Naxos]], Colony One, until a force of Space Marines from the [[Iron Snakes]] chapter under the command of Captain [[Trokus]] turns up to resolve the situation.~~|[[Tactica Imperialis]],~~ {{~~CME~~Fn|56}}|

|-

|''[[Wayward Son]]'', an escort vessel belonging to the flotilla of [[rogue trader]] [[Caleb Gilderoy]], appears at the outer perimeter of an [[Adeptus Mechanicus]] outpost at [[Harrow Watch]]. Garbled communications claim that the ship suffered severe damage from hostile xenos and a warning of a force that destroyed Gilderoy's flotilla. The ship refuses to turn back and is destroyed when it enters Harrow Watch's exclusion zone.{{Fn|32b}}

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|rowspan=2|812.M41

|Fleets from the [[Malan'tai]], [[Iyanden]], and [[Idharae]] [[Craftworld]]s eliminate [[Hive Fleet]] [[Naga]], but a [[Doom of Malan'tai|single bioform]] infiltrates and consumes Malan'tai.{{Fn|39}}{{Fn|44c}}{{Fn|44f}}|~~[[Codex: Tyranids (5th Edition)]], pgs. 16–17 & 58; [[Codex: Eldar (6th Edition)]], pg. 22~~

|-

|The [[Purging of Contqual]]: The [[Iron Hands]] drive the forces of [[Chaos]] from a dozen planets on the [[Contqual]] subsector.{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|199.812.M41

|-

|rowspan=2|815.M41

|Contact is lost with Explorator Fleet 913. Three companies of the [[Ultramarines]] are sent to investigate, but find only empty vessels drifting in space.{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~

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|[[Dal'yth]] [[sept]] receives unexpected aid from Commander [[O'Shovah|Farsight]] to repel an invasion by the [[Ork]] [[warboss]] [[Grog]].{{Fn|29c}}

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|818.M41

|[[Throth Half-Head]] of the [[Space Wolves]] defeats the giant [[Ur-Bolg]] wreaking havoc on [[Fenris]].{{Fn|38a}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 18~~

|-

|649.818.M41

|-

|rowspan=2|819.M41

|A perceived insult provokes fighting between the [[Mortifactors]] and the [[Crimson Fists]]. Only an intercession by [[Ultramarines]] [[Chapter Master]] [[Marneus Calgar]] prevents open war, and the incident is kept secret from the [[Adeptus Terra]].{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|An outbreak of contagious madness and despair affects [[Ilsig Hive]] on [[Chemarium II]], causing thousands to kill themselves. Civil order collapses. [[Ranker Nonesuch]], the self-titled "Beggar King," arises to lead his followers to overthrow the planetary government and spread his malevolence to the rest of the system. An exclusion zone is established around the system.{{Fn|32b}}{{Fn|32c}}

|-

|rowspan=2|822.M41

|Forces from [[Craftworld]] [[Alaitoc]] drive off a raid on [[Ildanira]] by [[Ezekyle Abaddon|Abaddon the Despoiler]]{{Fn|42b}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 127~~

|-

|[[Wolf Lord]] [[Erik Morkai]] ambushes the pirates of the [[Kabal of the Shattered Hand]] over the Leutin Necropolis. {{Fn|38b}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 19~~

|-

|101.822.M41

|-

|835.M41

|The [[War for Piety]]. [[Piety (Shrine World)|Piety]] emerges from a [[Warp storm]] overrun by [[Daemons]]. [[Canoness]] [[Sariah]] leads a mission of her [[Order of the Sacred Rose]] to recover valuable artifacts from the Reliquary of Hope, one of the few untainted areas. Only the Canoness and two Celestians survive entering the Reliquary, but recover Saint [[Dolan]]'s right thighbone and three pages of the [[Lexicon of Falsehoods]]. They leave just before a fleet of [[Grey Knights]] arrives and performs [[Exterminatus]] on the planet by [[cyclonic torpedoes]].~~|[[Codex: Sisters of Battle (5th Edition)]]~~{{~~CME~~Fn|64}}|

|-

|837.M41

|[[Space Wolves]] and [[Flesh Tearers]] fight, brother against brother, in a dark moment for both [[Chapters]] at the battle of [[Honour's End]].{{Fn|38b}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 19~~

|-

|841.M41

|Ninety-four years after the [[Battle for Macragge]], the [[Ultramarines]] [[First Company]]'s operational strength exceeds fifty percent for the first time.{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~

|-

|844.M41

|-

|rowspan=2|845.M41

|[[Dark Eldar]] pirates capture [[Warmaster]] [[Ingenus]], commander of the [[Dimmamak War]], escalating the situation. In response, all high ranking [[Imperial Guard]] officers are assigned bodyguards and another forty thousand regiments are raised.{{Fn|45a}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 22~~

|-

|The [[Blood Swords]] [[chapter]] purges the [[Inando]] system. More than one hundred billion Imperial citizens are slain in the resulting [[Exterminatus]] actions.{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|rowspan=3|849.M41

|[[Cato Sicarius]], [[Space Marine Captain|Captain]] of the [[Ultramarines]]' Second Company, is appointed [[High Suzerain of Ultramar]].{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~

|-

|All contact is lost with [[Birmingham]], the Black Planet. Subsequent investigations confirm a [[Dark Eldar]] massacre.{{Fn|42b}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 127~~

|-

|The 813th [[Feast of Blades]]. [[Hervald Strom]] of the [[Iron Knights]] is victorious yet again, despite suffering heavy wounds in the [[Vinculus Crusade]]. It is the first time in the history of the event that a single Chapter, let alone a single Champion, has won two successive victories.{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|850.M41

|Inquisitor [[Solomon Lok]] leads an expedition to the [[Anphelion System]]. See also - [[Anphelion Project]]{{Fn|42b}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 127~~

|-

|850-901.M41

|-

|852.M41

|The [[Invaders]] [[chapter]] assault the [[Eldar]] [[Craftworld]] [[Idharae]]. They succeed in destroying the planet, despite taking horrendous casualties.{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|rowspan=3|853.M41

|[[Battle of the Steel Cross]]. Captain [[Cortez]] of the [[Crimson Fists]] slays an [[Ork]] [[Warboss|Warlord]] and his bodyguard.{{Fn|46b}}|~~[[Codex: Space Marines (3rd Edition)]], pg. 39~~

|-

|The [[Daemonbane War]]: The [[Great Company]] of [[Wolf Lord]] [[Sven Bloodhowl]] is saved on the world of [[Yaogeddon]] when the [[Radical]] [[Inquisitor Lord]] [[Querrian]] turns the rival hordes of [[Khorne]] and [[Slaanesh]] against each other. When the [[Ordo Malleus]] demands Querrian's execution, the [[Space Wolves]] fight against their forces until Querrian can escape.{{Fn|38b}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 19~~

|-

|The [[Second Krandor Rebellion]].{{Fn|26c}}

|-

|855.M41

|The [[Assault on Black Reach]]: The [[Ultramarines]] Second Company under Captain [[Cato Sicarius]] defeats [[Waaagh! Zanzag]] on [[Black Reach]].{{Fn|3d}}{{Fn|3b}}|~~[[Codex: Space Marines (5th Edition)]], pgs. 36–37 & 40~~

|-

|rowspan=2|857.M41

|[[Saim-Hann]] Eldar launch a surprise assault on the Mortant VII 'Headhunters' during the Sacking of [[Colonia]]. A single squad of [[Catachan Jungle Fighters|Catachan Devils]], led by [[Imperial Guard Sergeant|Gunnery Sergeant]] [[Harker]] drives back the xenos after emerging from cover and killing the Eldar's [[Autarch]].{{Fn|45a}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 22~~

|-

|The fleet of the [[Silver Skulls]] [[chapter]] blockades the worlds of the [[Lazar]] system for three years. Since the worlds are dead, questions are asked, but no answers are ever given by the Silver Skulls.{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|858.M41

|The [[Defence of Dimmamar]]: The birth world of [[Sebastian Thor]] is suddenly attacked by [[Farseer]] [[Kauerith]] leading elements of the [[Eldar]] [[Craftworld]] [[Ulthwé]]. Though no reason for the attack is evident, the Farseer is killed in the course of the battle by Seraphim Superior [[Amelda]] of the [[Order of the Bloody Rose]] and her squad.~~|[[Codex: Sisters of Battle (5th Edition)]]~~{{~~CME~~Fn|64}}|

|-

|rowspan=2|861.M41

|[[Battle of Arconar]]. [[Marneus Calgar]] defeats a coalition of [[Eldar]] Raiders on the feral world of [[Arconar]], scattering their forces and capturing their bases both on and off world.{{Fn|46a}}|~~[[Codex: Space Marines (3rd Edition)]], pg. 36~~

|-

|The [[Ultramarines]]' [[chapter]] records indicate that they have finally replaced their losses from the [[Battle for Macragge]].{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~

|-

|862.M41

|[[Waaagh! Skullkrak]] invades the [[Targus system]]. [[Kayvaan Shrike]] and the [[Raven Guard]] Third Company are among the forces that respond.{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|863.M41

|The [[Saint Cyllia Massacre]]: The [[Adamant Fury]] [[Titan Legion]] falls to Chaos and massacre the [[Saint Cyllia]] [[PDF]] before escaping~~1~~. {{Fn|42b}} Leading the Cadian 423rd, Knight Commander [[Pask]] engages rearguard elements of the traitor Titan Legio.~~2~~ {{Fn|45a}}|~~1[[Warhammer 40,000 5th Edition Rulebook]], pg. 1272[[Codex: Imperial Guard (5th Edition)]], pg. 22~~

|-

|865.M41

|The Purging of [[Modanna]]: [[Kor'sarro Khan]], [[Master of the Hunt]] of the [[White Scars]], drives the [[Daemon Prince]] [[Kernax Voldorius]] from his most important fortress.{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|867.M41

|[[Space Marine Captain|Captain]] [[Cortez]] of the [[Crimson Fists]] breaks through [[Eldar]] lines, despite suffering seventeen wounds, including a stab through one of his hearts and two heavy weapons hits.{{Fn|46b}}|~~[[Codex: Space Marines (3rd Edition)]], pg. 39~~

|-

|870.M41

|[[Mogul Kamir]] and [[Imperial Guard]] [[regiment]]s of [[Attila]] deploy in force on the planet of [[Loxar IV]] to fight a three-year campaign against the [[Necrons]]. Victory is finally taken after the ill-fated charge of the Lumen Valley, the largest calvary charge to take place in records of the Imperium.{{Fn|45a}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 22~~

|-

|871.M41

|The [[Liberation of Quintus]]: With the aid of [[Kayvaan Shrike]] and the [[Raven Guard]] [[3rd Company (Raven Guard)|Third Company]], [[Kor'sarro Khan]] slays [[Kernax Voldorius]] in the streets of [[Mankarra]], and returns with the Daemon Prince's head to the [[White Scars]]' [[fortress-monastery]].{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|876.M41

|-

|877.M41

|An enormous [[Void whale]] emerges from the [[Warp]], mutated by exposure to the Empyrean. The [[Space Wolves]] of [[Engir Krakendoom]]'s Great Company board the entity before it can destroy the stronghold of [[Perillia]], combating the entire hostile ecosystem in the whale's innards, before planting demolition charges on its vital organs and escaping seconds before the explosion. The [[Perillian Gas Belt]] is born from the whale's remains. The gas belt overtakes [[Rillith]] and [[Deith]], bringing [[Perillian Catastrophes|catastrophes]]. The [[Inquisition]] resorts to sorcery to disperse the gas belt.{{Fn|14b}}{{Fn|38b}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 19~~

|-

|878.M41

|[[Chaos]] pirates, led by the [[Daemon Prince]] [[M'kar]], claim several uninhabited planets on the borders of [[Ultramar]]; [[Ultramarines]] Captain [[Cato Sicarius]] destroys most of the pirate fleet in a battle in the [[Halamar Rift]], though M'kar escapes into the [[Warp]].{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~

|-

|879.M41

|[[Battle of Knarts Landing]]. [[Marneus Calgar]] defeats a rebel army led by General [[Dornal]] in a thirty-day battle on the industrial world of [[Knart's Landing]], taking less than 17% casualties.{{Fn|46a}}|~~[[Codex: Space Marines (3rd Edition)]], pg. 36~~

|-

|rowspan=2|883.M41

|The largest armoured assault since the [[Battle of Tallarn]], spearheaded by the [[Cadian 423rd]], attacks and nearly annihilates a renegade [[Titan Legion]] in a battle on the [[Planus Steppes]]. Imperial forces are to endure the loss of over eight thousand tank companies and thirty five super-heavy detachments.{{Fn|45a}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 22~~

|-

|[[Dark Eldar]] warriors of the [[Kabal of the Black Heart]] raid Imperial Munitions Relay Base 359, causing the western Imperial flank to collapse during the Irgax Offensive and threatening the stability of the Imperial presence on Kyobin and the entire subsector.{{Fn|26g}}

|-

|886.M41

|A deputation from the [[Ecclesiarchy]] visits the [[Space Wolves]]' homeworld of [[Fenris]], planning to investigate rumours of pagan worship. The Wolves open fire on the fleet, provoking a three-week war between the Wolves and three orders of the [[Adepta Sororitas]], which ends when the Ecclesiarchy decides to retreat.{{Fn|38b}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 19~~

|-

|rowspan=2|888.M41

|The [[Battle for Orar's Sepulchre]]: The entire [[Ultramarines]] [[chapter]] goes to war for the first time since the [[Battle for Macragge]] to defend [[Orar's Sepulchre]] on planet [[Commrath]] from [[Eldar]] forces from [[Craftworld]]s [[Alaitoc]] and [[Iyanden]]. In the final battle, [[Marneus Calgar]] defeats the Alaitoc [[Avatar]] in single combat.{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~

|-

|The Crusade of Wrath: [[Black Templars]] defeat the [[Word Bearers]] and reclaim many worlds near the [[Maelstrom]].{{Fn|42b}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 127~~

|-

|rowspan=2|891.M41

|The Persya sector undergoes the 'long midnight' as [[Eldar]] pirates prey on them for over half the year, until driven off by Imperial Patrol Praxion.{{Fn|42b}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 127~~

|-

|On Yurk, grav-tank [[skimmer]]s from [[craftworld]] [[Iyanden]] destroy the forces of [[ork]] warlord Killfist without a single loss, preventing a [[Waaagh!]] from forming and threatening a nearby [[eldar]] colony.{{Fn|39}}|~~[[Codex: Eldar (6th Edition)]], pg. 22~~

|-

|892.M41

|[[Space Marine Captain|Captain]] [[Cortez]] defends the breach in Fortress [[Maladon]]'s wall in twenty-one hours of constant fighting.{{Fn|46b}}|~~[[Codex: Space Marines (3rd Edition)]], pg. 39~~

|-

|894.M41

|-

|rowspan=2|895.M41

|[[Craftworld]] [[Alaitoc]] launches a devastating invasion of the [[Invaders]]' home world in retaliation for their destruction of [[Idharae]]. With the Invaders still under-strength, only three companies escape the disaster and their [[fortress-monastery]] is destroyed. The Invaders are thereafter a spacebound chapter.{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|The [[Space Wolves]] and a host of [[Eldar]] [[Aspect Warriors]] ally to destroy the [[Waaagh!]] of [[Grimtusk Bloodboila]]. The operation is a success, but a simple mistranslation at the victory celebration afterwards leads to a fight breaking out, followed by open war between the Wolves, Eldar, and Orks.{{Fn|38b}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 19~~

|-

|rowspan=4|897.M41

|[[Sisters of Battle]] fortress-convent [[Sanctuary 101]] is completely destroyed. This raid is the first recorded Imperial contact with the [[Necron]]s.{{Fn|42b}}|[[Codex: Necrons (3rd Edition)]], pg. 11 - ''Darkness Rising''~~; [[Warhammer 40,000 5th Edition Rulebook]], pg. 127~~

|-

|[[Faze V]] is re-discovered by a [[Rogue Trader]] who has the support of the [[Dark Angels]] Fifth Company. The local human population is mind-linked with a huge artificial intelligence and the Dark Angels destroy it. Millions of locals rise up against the Imperium and the Dark Angels crush the rebellion and burn the planet to the ground. [[Bekenel]], [[Dark Angels Grand Master|Grand Master]] of the [[Deathwing]], retrieves some data from the machine complex.{{Fn|21a}}

|[[Codex: Dark Angels (3rd Edition)]], pg. 20

|-

|[[Hive Fleet]] [[Colossus]] descends upon the Imperial world of [[Thressiax]]. Ignoring the orders of Imperial Command, [[Wolf Lord]] [[Bran Redmaw]] details two squads of [[Grey Hunters]] to protect the planet's spaceport from the [[Tyranids]] long enough for the civilian population to evacuate. {{Fn|38b}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 19~~

|-

|[[Battle of Centius Prime]]{{Fn|8c}}

|-

|897-903.M41

|[[Hive Fleet]] [[Gorgon]] eats through the [[Tau Empire]] until a combined force of Tau and [[Imperium of Man]] fleets stops it at [[Kel'shan]].{{Fn|29c}}{{Fn|44d}}|~~[[Codex: Tyranids (5th Edition)]], pgs. 18–21~~

|-

|898.M41

|-

|900.M41

|The [[Tau]]'s listening post on [[Morix Prime]] is eliminated by the [[Ultramarines]]' 4th Company.{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~

|-

|901.M41

|-

|901-912.M41

|[[Lugft Huron]], [[Chapter Master]] of the [[Astral Claws]], revolts. An Imperial investigation fleet is destroyed in orbit of [[Badab]], killing 23,000 agents of the Imperium. Huron declares himself Tyrant of Badab and secedes from the Imperium. The [[Badab War]] follows.{{Fn|25a}}{{Fn|42b}}|[[Codex: Chaos Space Marines (4th Edition)]], pg. 57~~; [[Warhammer 40,000 5th Edition Rulebook]], pg. 127~~

|-

|902.M41

|[[Codex: Chaos Space Marines (4th Edition)]], pg. 57

|-

|Captain [[Cortez]] fights through the entire six-week Kardian campaign without supplies after they had been lost to enemy fire during deployment.{{Fn|46b}}|~~[[Codex: Space Marines (3rd Edition)]], pg. 39~~

|-

|[[Hive Fleet]] [[Gorgon]] is destroyed by the combined forces of the [[Tau]] and the [[Imperial Guard]].{{Fn|44d}}|~~[[Codex: Tyranids (5th Edition)]], pgs. 18–21~~

|-

|rowspan=2|904.M41

|[[Codex: Chaos Space Marines (4th Edition)]], pg. 57

|-

|[[Svengar the Red]] of the [[Space Wolves]] and his men disappear forever after sailing through a [[wyrmhole]] in search of [[Leman Russ (primarch)|Leman Russ]].{{Fn|38c}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 20~~

|-

|The [[Death Korps of Krieg]] are sent to the world of [[Derondii]] in punishement for withheld tithes. The Death Korps spend the next ten years bombarding the world's cities to rubble, five years after recieving an unconditional surrender and two years after the last sign of life is spotted.

|-

|rowspan=2|913.M41

|Disciples of [[Ahriman]] sack the [[Jollana]] Librarium.{{Fn|42b}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 127~~

|-

|[[Molov Massacre]]. All details purged by [[Inquisition]]{{Fn|8c}}

|-

|rowspan=2|920.M41

|Loss of the troopship ''Emperor's Faithful'' to Eldar pirates. Over five million Guardsmen and 200,000 Naval personnel are listed as missing.{{Fn|42b}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 127~~

|-

|The [[Tau Empire]] claims Ur-Clemait until the [[Word Bearers]] return to claim their Blood Tithe.{{Fn|25c}}

|-

|921.M41

|[[Marneus Calgar]], [[Chapter Master]] of the [[Ultramarines]], is ambushed by the [[Night Lords]] while en route to the [[Darkhold]] battlezone, and his ship crash-lands on the feudal world of [[Barathred]]. Several hundred [[Chaos Space Marines]] of the Night Lords make planetfall, but under Calgar's leadership, the planet's feudal population rises up and defeats them.{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~

|-

|922.M41

|-

|rowspan=2|925.M41

|Contact lost with eighteen planets in the Vidar sector, including the forge world [[Lentrel Prime]].{{Fn|42c}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 128~~

|-

|[[Waaagh! Grax]] invades the [[Ryza]] system. Regiments are raised from planets within ten light years, including the worlds of [[Barac]], [[Ulani]], [[Dulma'lin]] and [[Catachan]]. To meet demand, four-fifths of Dulma'lin's populace is drafted. The Orks would eventually be broken decades later at the [[Battle of Desolation Valley]] by Commander [[Mordrid van Hordric]].{{Fn|45a}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 22~~

|-

|rowspan=3|926.M41

|The [[Vaxhallian Genocides]]: [[The Purge]] slaughter over fourteen billion Imperial citizens in a single month.{{Fn|25b}}{{Fn|42c}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 128~~

|-

|The [[Dulma'lin Cleansing]]: The [[Catachan II]], led by [[Colonel]] [[Straken|"Iron Hand" Straken]], the only [[regiment]] to survive planetfall on [[Dulma'lin]], fights a year-long guerrilla war against the [[Ork]] invaders, destroying the Orks' main settlement two days ahead of the arriving Imperial reinforcement.{{Fn|45b}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 23~~

|-

|The [[Necron]] [[World Engine]] is destroyed on the edge of the [[Doranno System]], thanks to the heroic sacrifice of the [[Astral Knights]] [[chapter]].{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|rowspan=2|927.M41

|[[Death or Glory (Novel)]], Editorial Note after Chapter One

|-

|An army of [[daemon]]s wipes out the famous armoured siege regiment of [[Hammeront IV]] under the command of [[Grand Marshal]] [[Lourgant]] during the [[Fallaxian Scourging]].{{Fn|45b}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 23~~

|-

|rowspan=2|928.M41

|Two opposing Eldar [[Phoenix Lords]] of the [[Striking Scorpions]] [[Aspect]], [[Arha]] and [[Karandras]], duel for seventeen days in the ruins of ancient [[Zandros]].{{Fn|42c}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 128~~

|-

|The [[Catachan II]], with the help of [[Planetary Defence Forces]] engage in search and destroy missions against [[Ork]] [[Kommando]]s in the polar ranges of the planet [[Ulani]].{{Fn|45b}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 23~~

|-

|rowspan=2|929.M41

|Due to the slow-moving machinations of the [[Administratum]], the news of the destruction of the [[Hammeront IV]] regiment fails to be passed onto the [[Departmento Munitorum]], which charges the regiment to lead the liberation of the Abraxis Citadel on [[Prassium]].{{Fn|45b}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 23~~

|-

|The [[Trenor Uprising]]. Three dozen [[Ultramarines]] [[Space Marine Scouts|Scouts]], under the directions of veteran Sergeant [[Torias Telion]], put down a rebellion on Trenor in less than a day.{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~

|-

|rowspan=2|930.M41

|The Orks under [[Krakskull]] are destroyed in a trap in a ravine on [[Arandra V]] by the [[Catachan XXIV|Catachan XXIV 'Waiting Death']].{{Fn|45b}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 23~~

|-

|[[Verdan Wars]]{{Fn|8d}}

|[[For the Emperor (Novel)]]{{CME}}

|-

|The [[Hammeront IV]] are charged with desertion by the Departmento Munitorum and their commander, Lord General [[Lourgant]], is posthumously sentenced to death.{{Fn|45b}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 23~~

|-

|932.M41

|[[Magos|Techno Magus]] [[Stannum Vir]] discovers a priceless [[STC]] relic on the [[Agri world]] of [[Jollov]]. Combined elements from [[Catachan Jungle Fighters|Catachan]], [[Mordian Iron Guard|Mordian]], [[Kanak]], [[Molov]], and [[Agathon]] regiments sacrifice themselves defending the spaceport from [[Hive Fleet Moloch]], buying Vir enough time to recover the artifact and escape.{{Fn|45b}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 23~~

|-

|rowspan=2|933.M41

|[[The Chapter's Due (Novel)]], Chapter Nine, pg. 181

|-

|[[Elysian Drop Troops]] of the [[Imperial Guard]] end a decade-long blockade of the [[Stranthium]] Orbital Space Docks, driving off [[Ork]] [[Kaptin]] [[Blacklaw]] and his [[Freebooterz]].{{Fn|45b}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 23~~

|-

|The Toran VI Massacres: The [[Crimson Fists]] defeat the warband of [[Chaos Lord]] [[Sathash the Golden]].{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|rowspan=2|935.M41

|[[M'kar]] returns from the [[Warp]] and seizes control of the [[Ramilies|star fort]] ''[[Indomitable]]'' with a horde of [[Daemon]]s, in the outer orbit of [[Calth]]. [[Marneus Calgar]] leads [[Terminator]]s from the [[Ultramarines]] [[First Company]] aboard the fort and defeats the Daemon Prince. M'kar is officially listed as destroyed, but Calgar later confesses that he was forced to imprison the Daemon within the star fort's warp core and set it adrift. Half of the Ultramarines' 5th Company is stationed aboard the fort to guard the daemon's prison.{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pg. 40; ~~[[The Chapter's Due (Novel)]], Chapter Three

|-

|An Imperial Guard offensive on [[Bren's World]] is stalled when it fails to overcome the defences of [[Haven's Spire]]. Elite [[Storm Trooper]] units break the deadlock by destroying several [[void-shield]] generators.{{Fn|45b}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 23~~

|-

|936.M41

|[[Hive World]] [[Derondii]] withholds its annual [[tithe]]s. The [[Death Korps of Krieg]] are deployed as an honour guard for the [[Departmento Munitorum]] investigation team. After locals lynch the team, the Death Korps levels the primary [[hive city]] with a ten-year artillery barrage.{{Fn|45b}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 23~~

|-

|rowspan=4|937.M41

|[[Inquisitor]] [[Pranix]] leads a strikeforce of [[Space Wolves]], [[Cadian Shock Troopers|Cadian]] and [[Tallarn Desert Raiders|Tallarn]] [[Imperial Guard]] in an attempt to wrest the [[Hollow Worlds]] from the control of the [[Red Corsairs]]. [[Huron Blackheart]] has preselected sections of tunnel collapsed, isolating and destroying portions of the Imperial army. The Imperial army is forced to withdraw.{{Fn|25b}}{{Fn|42c}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 128~~

|-

|The [[Imperial Navy]] finally catches up with the [[Ravagers (Warband)|Ravagers]] over the [[Tau]] colony of [[Salomine]], resulting in the destruction of most of the warband. [[Salomine]] then possibly falls to the Imperium.

|[[The Traitor's Hand (Novel)]], Chapters One and Nineteen through Twenty

|-

|The [[Cadian 9th]] devastates [[Hive Fleet]] [[Scarabus]] at the walls of Fortress Carcasson without losing a single company.{{Fn|45b}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 23~~

|-

|938.M41

|The [[Battle for Moden's Ridge]]: On [[Yaquit 27]] Colonel [[Straken]] leads the [[Catachan II]] in a charge that exterminates the [[L'Huraxi]] invaders, who outnumber the Imperial Guardsmen more than ten to one.{{Fn|45b}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 23~~

|-

|rowspan=3|939.M41

|While serving with the [[70th Luther McIntyre]] [[regiment]] on [[V'run]], responding to [[Ork]] attacks occurring throughout the [[Segmentum Solar]], [[Commissar Yarrick]] learns the Ork language from a captured greenskin.{{Fn|45b}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 23~~

|-

|A [[Chaos Space Marine]] ambush kills [[Dark Angels]] [[Supreme Grand Master]] [[Naberius]]. [[Azrael]] leads the [[Deathwing]] to recover his body and is named his successor.{{Fn|21a}}

|[[Realm of Chaos]]{{CME}}

|-

|The conquest of [[Atria IV]] grinds to a halt outside the Palace of Hate, impregnable to the Imperial forces.{{Fn|45b}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 23~~

|-

|941.M41

|The [[Second War for Armageddon]]: A massive [[Ork]] [[Waaagh!]] led by [[Ghazghkull Mag Uruk Thraka]] assaults the [[hive world]] [[Armageddon Secundus]]. [[Governor|Overlord]] [[Herman von Strab]]'s forces are saved by [[Commissar Yarrick]]'s leadership, buying enough time for elements from the [[Blood Angels]], [[Ultramarines]] and [[Salamanders]] [[Space Marine]] [[Chapter]]s to arrive and push the Orks off-world.{{Fn|42c}}{{Fn|45b}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 128; [[Codex: Imperial Guard (5th Edition)]], pg. 24~~

|-

|942.M41

|-

|rowspan=2|944.M41

|[[Commissar Yarrick]] comes out of retirement and devotes the rest of his life to hunting down [[Ghazghkull Thraka]].{{Fn|42c}}{{Fn|45c}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 128; [[Codex: Imperial Guard (5th Edition)]], pg. 24~~

|-

|[[Balur Crusade]]: [[Marneus Calgar]] is elected leader of the [[Space Marine]] [[Crusade]] force operating against worlds along the [[Eastern Fringe]]s. Operations began with scouring of [[Ork]]-held Balur and ending with devastation of [[Boros]].{{Fn|46a}}|~~[[Codex: Space Marines (3rd Edition)]], pg. 36~~

|-

|945.M41

|On [[Atria IV]] sappers from the [[Catachan XXIII]] breach the walls of the Palace of Hate within a week of their arrival.{{Fn|45b}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 23~~

|-

|945-959.M41

|-

|rowspan=2|949.M41

|The 814th [[Feast of Blades]] is held. Only eight of the twelve competing [[Space Marine]] [[chapter]]s are able to attend. The championship is tied between the [[Imperial Fists]] and the [[Crimson Fists]].{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|[[Dark Angels]] [[Librarian]] [[Ezekiel]] kills [[Ork]] Warlord [[Groblinik]] in the [[Battle of the Sularian Gate]], ending his [[Waaagh!]]{{Fn|21a}}

|-

|rowspan=2|951.M41

|The [[Amar_(World)|Amar]] secession is brought to a swift end by the rapid strikes of the [[Howling Griffons]] [[chapter]].{{Fn|33f}}

|

|-

|rowspan=2|954.M41

|The Fall of Rogue's Spire: [[Waaagh! Dethrekka]] attacks the sparsely defended planet, and only the fighting retreat by the [[Sable Swords]] allows the [[Explorator]] and [[Mechanicus]] research teams to escape.{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|On the planet [[Cyriax]], something huge and terrible awakens beneath Hive Necros, killing hundreds of the city's inhabitants. [[Great Wolf]] [[Logan Grimnar]] sends his elite [[Thunderwolf Cavalry]] to hunt down the [[Abomination of Cyriax]].{{Fn|38c}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 20~~

|-

|rowspan=6|955.M41

|

|-

|[[Daemons]] overrun [[Talus IV]], the [[homeworld]] of the [[Brazen Claws]] [[Space Marine Chapter]].{{Fn|3a}}|~~[[Codex: Space Marines (5th Edition)]], pg. 30~~

|-

|The [[Imperial Fists]] committed to the [[Siege of Fort Mork]] are nearly overwhelmed when thousands of [[Orks]] pour from the gates in a counter-attack.

|-

|rowspan=3|956.M41

|The [[Kieldar Rebellion]] is crushed by a combined force of the [[Imperial Guard]].{{Fn|45c}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 24~~

|-

|Task force of [[Red Hunters]] and [[Inquisition]] were lost near moons of [[Lomea]] following the penitent crusade of the [[Mantis Warriors]] during '''The Red Hunt'''{{Fn|8d}}

|[[White Dwarf 99 (UK)]], Legion of the Damned; [[Codex: Ultramarines (2nd Edition)]], pg. 63

|-

|The [[Ultramarines]] clash with [[Tau]] colonisation forces in the [[Battle of Malbede]]; both armies later unite against [[Necron]] awakening. The Tau escape the planet, which is destroyed in an [[exterminatus]] ordered by [[Marneus Calgar]] shortly afterwards.{{Fn|42c}}{{Fn|3d}}|~~[[Warhammer 40,000 5th Edition Rulebook]] pg. 128; [[Codex: Space Marines (5th Edition)]], pg. 40~~

|-

|[[Space Wolves|Space Wolf]] [[Thorgir Redhand]] is the lone survivor when his [[Thunderhawk]] crash-lands on Isoulde, shot down by an enormous dragon. Thorgir slays the dragon, collapsing one of the planet's cathedrals down on both of them. He is dug out, still alive, by the grateful populace.{{Fn|38c}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 20~~

|-

| The [[Grey Knights]] [[2nd Brotherhood (Grey Knights)|Second Brotherhood]] successfully defend against [[Ork]] forces in the [[Assault on Beroghast]] and kill their leader [[Warboss]] [[Snappaklaw]].

|-

|rowspan=2|964.M41

|[[Darnath Lysander]] of the [[Imperial Fists]] escapes from the [[Iron Warriors]]' stronghold on [[Malodrax]] and returns to his [[chapter]], though it will be almost a year before he is pronounced free of chaotic taint and fit to return to duty.{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|The [[Subjugators]] [[Chapter]] and the [[Deathwatch]] destroyed the unnamed [[xenos]] race in the [[Tyrama Secundus Campaign]] {{Fn|8d}}

|-

|rowspan=5|966.M41

|Lysander leads the [[Imperial Fists]] to [[Malodrax]] and scours the [[Iron Warriors]] from the planet.{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|[[Wolf Lord]] [[Gunnar Red Moon]] takes battle to the [[Tau]]'s hidden underwater cities on the [[Ocean World]] [[Kvariam Alpha]], driving [[Land Raider]]s straight across the seabed. The Tau flee when the Wolves crack the domes of their cities.{{Fn|38c}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 20~~

|-

|During an attack on the Imperial city of [[Chalior]], the [[Eldar]] [[Phantom Titan]] ''[[Heart of Eldanesh]]'' is destroyed by a [[Vortex Missile]] launched from the Grand Redoubt protecting the city.

|-

|968.M41

|The [[Khai-Zhan Uprising]]: Rebels capture every major population centre in one night. An Imperial Guard counter attack takes the capital city of [[Vogen]] after a series of brutal street battles. The entire planet is recaptured within a month, but at the cost of nine-tenths of the regiments despatched to Khai-Zhan.{{Fn|45c}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 24~~

|-

|rowspan=2|969.M41

|The [[Death Guard]] battleship ''[[Terminus Est]]'', the flagship of [[Typhus]], is spotted in the Cando system. The [[Zombie Plague]] sweeps across the system in the following months.{{Fn|42c}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 128~~

|-

|[[Invasion of Taladorn]]: [[Taladorn]] is invaded by [[Iron Warriors]]. The [[Imperial Fists]] with some support from the [[Ultramarine]] and [[Blood Angels]] defeat the assault.

|-

|rowspan=3|970.M41

|A [[Necron]] Tomb awakens on [[Bellicas]], the home world of the [[Emperor's Swords]] [[chapter]]. Not one [[Space Marine]] survives.{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|[[Drashin]] was invaded by Tyranids who emerged from the [[Warp]] in a [[Space Hulk]]. Though the Imperial forces led by the [[Imperial Fists]] were eventually victorious, millions of its citizens perished.

|-

|rowspan=2|971.M41

|The [[Ork]] [[Wazdakka Gutsmek]] begins his plan to create an interstellar "supa'eyeway" through the [[Warp]].{{Fn|42c}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 128~~

|-

|The [[Crusade of Thunder]] ends with the [[Fall of Malodrax]] when the [[Malodrax|planet]] becomes subject to [[Exterminatus]].

|-

|974.M41

|The [[Damnos Incident]]: The [[Ultramarines]] Second Company, led by Captain [[Cato Sicarius]], rescues survivors from the doomed world of [[Damnos]] as the [[Necrons]] on the planet awaken.{{Fn|3c}}{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pgs. 38–40~~

|-

|rowspan=5|975.M41

|The [[Cadia]]n fortress-world [[Lutoris Epsilon]] is lost to [[Khorne]]ate temptation initiated by [[Skarbrand]] the [[Bloodthirster]].{{Fn|42c}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 128~~

|-

|A squad of [[Cadian]] [[Whiteshield]]s, led by the young [[Ursarkar Creed]], are hurled into the five-year [[Drussite Crusade]]. By the end of the campaign, Creed has been promoted to [[Imperial Guard Captain|Captain]].{{Fn|45c}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 24~~

|-

|[[Eldar]] [[craftworld]] [[Lugganath]] falls to the Brittle Coma. Its seers project themselves into the Garden of [[Nurgle]] in search of [[Isha]] and are lost.{{Fn|14a}}{{Fn|14b}}

|-

|rowspan=2|978.M41

|[[Commissar Yarrick]] is captured at [[Golgotha]] and his personal [[Baneblade]], the ''[[Fortress of Arrogance]]'', is destroyed. Yarrick escapes a few weeks later under mysterious circumstances, but the planet is completely overrun by the [[Ork]]s.{{Fn|45c}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 24~~

|-

|[[Bhorc Prime]], was a site of constant struggle between [[Orks]] and the [[Imperium]]. It went on until the Ork [[Klawjaw]] united all Ork factions on the planet and started a massive [[Waaagh!]]. Despite their victories, Imperium's forces faced defeat on Bhorc Prime. The whole planet was soon under Ork control and Warboss Klawjaw began his Waaagh! against the [[Imperium]]. It would later lead to the creation of one of the biggest Ork domains - the [[Ork Empire of Bork]].{{Fn|4}}

|-

|979-988.M41

|The [[Damocles Gulf Crusade]]. Several Imperial worlds defect to the [[Tau Empire]], initiating the prolonged crusade, which is abandoned when [[Hive Fleet]] [[Kraken]] emerges in the [[Eastern Fringe]].{{Fn|45c}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 24~~

|-

|rowspan=2|980.M41

|[[Chaos Lord]] [[Brule]] and his [[Chaos Space Marines]] are destroyed on [[Treconodal]] by a combined force of the [[Cadian 8th]] and the [[Terrax Guard]].{{Fn|45c}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 24~~

|-

|The [[Promethean War]]. The [[Salamanders]] fight an urban war against the [[Black Legion]] on [[Heletine]]. The [[Order of the Ebon Chalice]] arrives to reinforce the [[Space Marines]] and together push forward, but their advance is stopped by [[Daemon Prince]] [[Lord Gralastyx]] and his [[Chaos Space Marines]] and the [[Imperium]] forces are nearly defeated. [[Saint Celestine]] appears suddenly and fights through the hordes and eventually kills Gralastyx and turns the tide of the battle. She disappears again just as suddenly.~~|[[Codex: Sisters of Battle (5th Edition)]]~~{{~~CME~~Fn|64}}|

|-

|rowspan=3|981.M41

|[[Book of the Astronomican]]{{CME}}

|-

|Taelos of the [[Imperial Fists]] takes a warrior pilgrimage through the [[Maelstrom]], Choria, Fell Heart, and [[Golgotha]]{{Fn|40b}}|~~[[Codex: Space Marines (4th Edition)]], inside back cover~~

|-

|The [[Battle of Parenxes]]. [[Red Corsairs]] lure the [[Space Wolves]] cruiser ''[[Wolf of Fenris]]'' into a trap, where they board the ship and [[Huron Blackheart]] kills [[Gnyrll Bluetooth]]. As their situation becomes clear, the few surviving Wolves turn to the enemy side, and the ''Wolf'' is captured.{{Fn|38c}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 20~~

|-

|982.M41

|

|-

|[[Ragnar Blackmane]] avenges the death of his [[Wolf Lord]], [[Berek Thunderfist]], by slaying the [[Chaos Champion]] [[Ghorox Bloodfist]] in single combat. Ragnar and his handpicked force later defeat Ghorox's allies from the [[Word Bearers]] during the [[Gravespite Massacre]]. Ragnar is acclaimed Berek's successor.{{Fn|38c}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 20~~

|-

|983-985.M41

|A [[Hrud]] migration is halted, due in no small part to the actions of the [[Cadian 8th]] and the tactical brilliance of [[Ursarkar Creed]].{{Fn|45c}}|[[Codex: Eye of Terror]], pg. 40~~; [[Codex: Imperial Guard (5th Edition)]], pg. 24~~

|-

|rowspan=2|984.M41

|-

|985.M41

|Eldar predations in the Underhives of Cathoria II.{{Fn|42c}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 128~~

|-

|986.M41

|[[Codex: Black Templars (4th Edition)]], pg. 44

|-

|[[Waaagh!]] [[Snagrod]] barrels through the Loki sector, devastating [[Rynn's World]] and the [[Crimson Fists]]. The [[Dark Angels]] reinforce the [[Crimson Fists]] to purge the [[Ork]]s from the sector.{{Fn|21a}}{{Fn|42c}}{{Fn|3f}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 128; [[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|The [[Ultramarines]] Third Company liberates the [[Lagan]] system from the [[Tau Empire]].{{Fn|29c}}{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~

|-

|rowspan=3|990.M41

|The ancient ruling class of nobility on [[Rophanon]] have their lands and power taken away from them when the [[Adeptus Terra]] decides to turn the planet into a retirement community for high-ranking clerks and a massive records storage facility. The council of Rophanon instigates a rebellion but [[Lord General]] [[Artemis Blythe]] just happens to be on the planet recovering from wounds suffered during a space battle. He leads the fight back, when eventually becomes mired in a war of attrition. When [[Hive Fleet Leviathan]] emerges near Rophanon the Imperials withdraw and let the Tyranids destroy the planet before letting the [[Deathwatch]] deliver the [[Exterminatus]].~~|[[Tactica Imperialis]]~~{{~~CME~~Fn|56}}|

|-

|The [[Fire Lords]] [[chapter]] descends on [[Bellicas]] and exterminates the [[Necrons]] there, avenging the destruction of the [[Emperor's Swords]].{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|The [[Dark Eldar]] noble [[Zorothriel]] captures [[Karanak]] on a hunt on the Daemon world [[Khornax]]. Karanak breaks free and kills everyone onboard Zorothriel's warship.{{Fn|14c}}

|-

|991.M41

|The [[Martyrdom of Praxedes]]. [[Canoness]] [[Praxedes]] of the [[Order of Our Martyred Lady]] assists the [[Imperial Guard]] on the [[cardinal world]] of [[Okassis]] against [[Hive Fleet]] [[Kraken]]. They defeat the first wave only to have the second wave breach the walls of the Ecclesiarchal Cathedral. Praxedes buys precious time for evacuation by slaying a [[Hive Tyrant]], but shortly afterward succumbs to a mortal wound. The disruption caused by the Hive Tyrant's death makes successful the evacuation of the [[Ecclesiarchy]]'s priests as well as civilians at the space port.~~|[[Codex: Sisters of Battle (5th Edition)]]~~{{~~CME~~Fn|64}}|

|-

|991.M41-Present

|[[Codex Imperialis (Background Book)]]{{CME}}

|-

|[[Ursarkar E. Creed]] annihilates [[Ulthwé]] raid on [[Aurent]].{{Fn|42c}}{{Fn|45c}}|[[Codex: Eye of Terror]], pg. 40~~; [[Warhammer 40,000 5th Edition Rulebook]], pg. 128; [[Codex: Imperial Guard (5th Edition)]], pg. 24~~

|-

|Necron Shroud class Light Cruiser encountered in Segmentum Pacificus.{{Fn|35b}}

|[[For the Emperor (Novel)]], ''Editorial Note before Chapter One''; [[Cain's Last Stand (Novel)]], Chapter One

|-

|[[Kraken]] devastates hundreds of worlds before it is halted. The [[Eldar]] [[Craftworld]] [[Iyanden]] is ravaged, and two [[Space Marine]] [[Chapter]]s are all but wiped out, the [[Scythes of the Emperor]] and the [[Lamenters]].{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~

|-

|[[Defence of Ichar IV]]. [[Marneus Calgar]] acts as supreme commander in defence of [[Ichar IV]], a vital industrial world on the [[Eastern Fringe]]. [[Tyranid]] invaders from [[Hive Fleet Kraken]] are held in check by the combined efforts of Space Marines, Imperial Guard and alien Eldar forces.{{Fn|42c}}{{Fn|3d}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 128; [[Codex: Space Marines (5th Edition)]], pg. 40~~

|-

|[[Iron Warriors]] [[Warsmith]] [[Vhostok Pistonhand]] takes control of [[Diesos]] and manufactures countless [[daemon engine]]s. The Ruinous Powers send massive Daemonic legions to free their servants. The war for Diesos ends within a month and then starts anew as the legions fight amongst themselves.{{Fn|14c}}

|

|-

|[[Tau]] fleet action at the shrineworld [[Ghola's Hope]].{{Fn|42c}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 128~~

|-

|[[Hive Fleet Jormungandr]] invades the north-eastern boundaries of the [[Imperium]]. [[Space Marines]] of the [[Death Spectres]] and [[Honoured Sons]] [[chapter]]s lead the counterattack.{{Fn|3f}}|~~[[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|A Warp-time dilation manifests over [[Thridia]], spawning [[daemon]]s from the very air. The defenders fall back toward Hive Vertes and right into awakening [[Necron Warrior]]s. The Necrons attack the daemons, allowing the Imperial Guard to reach the hive. The men are mind-wiped and the battlefields bombarded.{{Fn|14c}}

|

|-

|[[Huron Blackheart]] attacks [[Parenxes]]. During the fight, [[Red Corsairs]] strike forces manage to board and capture the [[Space Wolves]] strike cruiser ''[[Wolf of Fenris]]''.{{Fn|25c}}{{Fn|42c}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 128~~

|-

|The "[[Cypher|Voice of the Emperor]]" makes himself known in the Agripinaa Sector, exhorting its inhabitants to rise up against the authority of the [[Administratum]].

|-

|rowspan=3|996.M41

|The [[Valhallan Ice Warriors|Valhallan 18th "Tundra Wolves"]] wipe out the vanguard of [[Hive Fleet Jormungandr]] at Goyan Valley, under the command of [[Kubrik Chenkov]].{{Fn|45c}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 24~~

|-

|Bora Culpa incident. Population found vanished after a recon by the [[Space Wolves]].{{Fn|35a}}

|[[Warhammer 40,000 3rd Edition Rulebook]], pg. 272

|-

|[[Hive Fleet]] [[Medusa (Hive Fleet)|Medusa]] invades the galaxy through the [[Ghoul Stars]].{{Fn|44e}}|~~[[Codex: Tyranids (5th Edition)]], pg. 29~~

|-

|A hundred thousand [[daemonette]]s take up a joking invitation to a party held by the ruler of [[Ferrite Mons]]. Even the [[Vostroyan Firstborn]] regiment falls to the daemonettes.{{Fn|14c}}

|-

|138.997.M41

|[[Hive Fleet Leviathan]] contacts the galactic base of the Imperium, causing destruction in Segmentums Tempestus, Ultima, and Solar. {{Fn|42c}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 128~~

|-

|221.997.M41

|The Ork Warlords [[Ghazghkull Mag Uruk Thraka]] and [[Nazdreg]] launch an attack upon the power plant of [[Kadillus Harbour]], the capital-city of [[Piscina IV]]. The [[Dark Angels]], under the command of Third Company Master [[Belial]] manage to disrupt his plans until further Dark Angels reinforcements manage to arrive. The Ork horde is driven off. {{Fn|21a}}{{Fn|21d}}{{Fn|42d}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 129;~~ [[Codex: Dark Angels (3rd Edition)]], pg. 19

|-

|310.997.M41

|-

|509.997.M41

|A combined [[Mortifactors]] and [[Ultramarines]] strikeforce defeat a tendril of [[Hive Fleet Leviathan]] at [[Tarsis Ultra]]. The remainder of the Hive Fleet rampages on, completely unaffected.{{Fn|42d}}{{Fn|3d}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 129; [[Codex: Space Marines (5th Edition)]], pg. 40~~

|-

|525.997.M41

|-

|601.997.M41

|[[Sebastian Yarrick]] and [[Ghazghkull Mag Uruk Thraka|Ghazghkull]] come face to face again on the world of [[Golgotha]]. Yarrick is captured and tortured but ultimately released - Ghazghkull is planning to invade [[Armageddon]] again, and wants a good fight.{{Fn|42d}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 129~~

|-

|622.997.M41

|[[Golgotha]]n refugees are slaughtered ''en masse'' by Dark Eldar raiders on the moon of Jagdor.{{Fn|42d}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 129~~

|-

|977.997.M41

|The [[Tau Empire]] resumes the Third Phase Expansion under [[O'Shaserra|Commander Shadowsun]]. They capture several worlds on the Eastern Fringe.~~|[[Warhammer 40,000 5th Edition Rulebook]]~~{{~~CME~~Fn|4x}}; |[[Codex: Tau Empire (4th Edition)]]{{CME}}

|-

|rowspan=9|998.M41

|

|-

|Hive Fleet [[Moloch]] attacks the galaxy through the Ghoul Stars.{{Fn|44e}}|~~[[Codex: Tyranids (5th Edition)]], pg. 29~~

|-

|[[Operation Thunderstorm]]. A [[Cadian]] Army Group lands on the [[Ork]]-held world of [[Golgotha]] to retrieve the remains of [[Commissar Yarrick]]'s command tank, the ''[[Fortress of Arrogance]]''. Although the Army Group takes horrific casualties, the tank is retrieved and repaired in time to serve as Yarrick's mount during the [[Third War for Armageddon]].{{Fn|45c}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 24; ~~[[Gunheads (Novel)]]{{CME}}

|-

|A [[Tyranid]] splinter fleet invades the [[Ice World]] of [[Shadrac]]. A company of [[Space Wolves]] appears unexpectedly to reinforce the small [[Imperial Guard]] force there. Only a handful of warriors escape, and Shadrac is lost, but the casualties inflicted on the Tyranids is enough to give the [[Hive Mind]] pause.{{Fn|38d}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 21~~

|-

|The [[Dark Angels]] and [[Black Templars]] come to blows over the handling of [[Cypher|a prisoner]]. [[Inquisitor]] Archibald is assigned to lead an inquiry.{{Fn|21a}}

|-

|757.998.M41

|The [[Third War for Armageddon]] begins. Having learned from past mistakes, Imperial Commanders commit a ridiculous amount of forces to hold the world, including elements from more than twenty [[Space Marine]] [[chapter]]s. It drags on for months in a bloody stalemate, and soon [[Ghazghkull Mag Uruk Thraka|Ghazghkull]] grows bored and leaves his generals to finish the fight while he goes looking for other worlds to conquer. [[Sebastian Yarrick]] joins the [[Black Templars]]' Crusade and gives chase.{{Fn|42d}}{{Fn|3f}}{{Fn|45c}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 129;~~ [[Codex: Armageddon]]{{CME}}~~; [[Codex: Imperial Guard (5th Edition)]], pg. 24; [[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|871.998.M41

|-

|rowspan=7|999.M41

|The [[Zeist Campaign]] sees the Imperium take back the worlds they lost in the Tau Third Sphere Expansion. The highly successful Campaign is led by [[Space Marine Captain|Captain]] [[Cato Sicarius]] of the [[Ultramarines]]' 2nd Company, along with elements from at least nine other Chapters and Imperial Guard Regiments. A thrust into the Tau Empire could not be sanctioned however, as the forces were recalled to their other duties.{{Fn|3e}}|~~[[Codex: Space Marines (5th Edition)]], pg. 48~~

|-

|[[Justicar]] [[Alaric]] of the [[Grey Knights]] accompanies [[Inquisitor]] [[Ligeia]] on a quest to prevent the [[Daemon Prince]] [[Ghargatuloth]] from returning to the Materium. The Grey Knights are unable to spare more men while deploying their forces to the [[Cadian Gate]] to combat the [[13th Black Crusade]].

|[[Cain's Last Stand (Novel)]]{{CME}}

|-

|During the [[13th Black Crusade]], A [[Cadian]] battlegroup, "[[Ursarkar Creed|Creed]]'s Blade," volunteers for a suicidal counterattack on the [[Daemon World]] of [[Voidsoul]] inside the [[Eye of Terror]]. The battlegroup is all but wiped out by the [[Daemon]]ic hosts, until a pack of mysterious [[Wulfen|wolf-creatures]] appear and tear into the Daemons. The few surviving Cadians return to the [[Cadian Gate|Gate]], and their mysterious rescuers are speculated to be brothers of the [[Space Wolves]]' lost [[13th Great Company]].{{Fn|38d}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 21~~

|-

|Exiled to the [[Elixir]] system for a practical joke, [[Lukas (Space Wolf)|Lukas the Trickster]] and his [[Blood Claws]] confront the immense vehicle armoury of [[Waaagh!]] [[Megamek]]. With a little research, Lukas and his pack infiltrate a [[Climatrope]] at the planet's pole with a [[Jump Pack]] assault and lower the planet's temperature, crippling the Orks' war machines before the Wolves arrive in the system in force.{{Fn|38d}}|~~[[Codex: Space Wolves (5th Edition)]], pg. 21~~

|-

|The [[Dark Angels]] trace the Voice of the Emperor to the Agripinaa Sector. They find and destroy a radio beacon in the approximate former location of [[Caliban]].

|-

|010.999.M41

|On [[Thracia]], [[Idaeus]], Captain of the [[Ultramarines]]' Fourth Company, passes his captaincy to [[Uriel Ventris]] before sacrificing himself in the Taking of Bridge Two-Four, denying a flanking route to the [[Night Lords]] before the final Imperial offensive.{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~

|-

|103.999.M41

|-

|4.105.999.M41

|[[Catachan Jungle Fighters|Catachan]] [[Guardsman]] [[Marbo]] is credited with single-handedly destroying the [[Ork]] [[Gargant]] ''Gorkanought'', though these reports are dismissed as farfetched by [[Segmentum Command]].{{Fn|45d}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 25~~

|-

|303.999.M41

|[[Ultramarines]] Captain [[Cato Sicarius]] leads a [[Crusade]] with elements from thirty Space Marine Chapters to halt the expansion of the [[Tau Empire]]. The Tau are driven off dozens of Imperial worlds in the [[Zeist]] sector, but the Crusade is halted before it can be completed.{{Fn|29c}}{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pg. 40~~

|-

|3.350.999.M41

|[[Colonel]] [[Schaeffer]] leads the [[13th Penal Legion]] into the [[Daemon World]] of [[Fool's Paradise]] to hunt down the [[Daemon Prince]] [[Mk'lrathirix]]. Only two survivors return.{{Fn|45d}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 25~~

|-

|561.999.M41

|-

|718.999.M41

|[[Hive Fleet Leviathan]] [[Octarian War|invades]] the Ork Empire in the [[Octarius]] system, and war rages with neither side showing any signs of stopping.{{Fn|42d}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 129~~

|-

|757.999.M41

|-

|3.789.999.M41

|[[Lord Marshal]] Graf [[Harazahn]] of [[Vostroya]] assumes control over a scattered [[Imperial Guard]] army ground and defeats the [[Eldar]] at the [[Gates of Balcarhsa]].{{Fn|45d}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 25~~

|-

|854.999.M41

|[[Ultramar]] is invaded by the [[Chaos]] horde known as the [[Bloodborn]], led by [[Warsmith]] [[Honsou]] and [[M'kar]] the Thrice Born. The entire [[Ultramarines]] chapter is mobilized to repel the invaders. [[Marneus Calgar]] confronts the Daemon Prince on [[Talassar]], sending him back to the Warp, though Honsou apparently escapes.{{Fn|3d}}|~~[[Codex: Space Marines (5th Edition)]], pg. 40; ~~[[The Chapter's Due (Novel)]], Chapters One, Three & Twenty-Four

|-

|884.999.M41

|-

|975.999.M41

|The light of the [[Astronomican]] grows dim; contact is lost with Ultima Macharia and becomes intermittent with both [[Macragge]] and [[Cypra Mundi]].{{Fn|42d}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 129~~

|-

|2.975.999.M41

|The [[Battle for Tyrok Fields]]: at the outset of the [[13th Black Crusade]], a murderous plot kills several members of the [[Cadia]]n High Command, including the [[Governor]] Primus. [[Ursarkar E. Creed]] takes command of the confused Imperial forces and routes the traitors, turning a Chaos victory into a Cadian triumph. Creed is appointed [[Lord Castellan]] of Cadia.{{Fn|45d}}|[[Codex: Eye of Terror]], pg. 40~~; [[Codex: Imperial Guard (5th Edition)]], pg. 25~~

|-

|978.999.M41

|[[Dark Eldar]] raiders cripple the Imperial Navy's port at [[Bakka]].{{Fn|42d}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 129~~

|-

|3.978.999.M41

|The [[Armageddon Steel Legion|Armageddon 45th Heavy Artillery]] decimate the Ork hordes of [[Minerva]]. Each shell is inscribed with the name of a soldier or civilian killed at [[Hades Hive]] during the [[Third War for Armageddon]].{{Fn|45d}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 25~~

|-

|980.999.M41

|The [[Red Corsairs]] emerge from the Maelstrom in force and lay siege to several systems, notably the Chogoris, Kaelas, and Sessec systems. The [[White Scars]] withdraw from the [[Armageddon]] theatre to meet the threat.{{Fn|25b}}{{Fn|42d}}{{Fn|3f}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 129; [[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|982.999.M41

|The [[Great Awakening]]: a ripple of psychic power flows through the Warp and activates the latent abilities of millions of psykers. Innumerable warp rifts are created and several worlds are lost to daemonic infestation. The [[Thousand Sons]] are seen in unprecedented numbers.{{Fn|14c}}{{Fn|25b}}{{Fn|42d}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 129~~

|-

|3.982.999.M41

|The 56th regiment of the [[Mordian Iron Guard]] put down the [[Komarl Revolt]], and, to ensure future compliance, executes ten percent of the remaining population for forgetting their duty to the [[Emperor]].{{Fn|45d}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 25~~

|-

|5.985.999.M41

|The Imperial World of [[Cytheria]] defects to the [[Tau Empire]]; a guerilla campaign by several [[Catachan]] regiments critically undermines the Tau's morale.{{Fn|45d}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 25~~

|-

|986.999.M41

|[[Tech Priest]]s of the [[Adeptus Mechanicus]] discover failures in the mechanisms of the [[Golden Throne]] that are far beyond their ability to repair.{{Fn|42d}}{{Fn|60b}}|~~[[White Dwarf 342 (US)]], pg. 37 — ''"Timeline"'' [[Warhammer 40,000 5th Edition Rulebook]], pg. 129~~

|-

|987.999.M41

|Necron activity detected within 2,000 light years of Terra.{{Fn|42d}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 129~~

|-

|989.999.M41

|The [[Ultramarines]] [[3rd Company (Ultramarines)|3rd Company]] liberate the Lagan system from the Tau Empire.{{Fn|42d}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 129~~

|-

|990.999.M41

|Eldar forces from the [[Biel-Tan]] and [[Saim Hann]] [[Craftworlds]] destroy both Imperial and Ork worlds surrounding the Octarius system with the intent of denying bio-resources to [[Hive Fleet Leviathan]].{{Fn|42d}}{{Fn|3f}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 129; [[Codex: Space Marines (5th Edition)]], pg. 49~~

|-

|6.990.999.M41

|The [[Knights of Blood (Warband)|Knights of Blood]] [[Chaos Space Marines]] attacks [[Ornsworld]]. Imperial Guard reinforcements do not arrive before ninety percent of the planet's population is killed, a cruel repeat of the events of the [[Gothic War]].{{Fn|45d}}|~~[[Codex: Imperial Guard (5th Edition)]], pg. 25~~

|-

|992.999.M41

|The [[Night of a Thousand Rebellions]]. Countless worlds across the Imperium fall into unrest and rebellion. Even worlds once thought secure, such as [[Enceladus]], [[Darkhold]] and [[Minisotira]], are affected. The homeworld of the [[Lions Defiant]] [[Chapter]] is lost to anarchy. Communication is lost with large swathes of [[Segmentum Pacificus]].{{Fn|25b}}{{Fn|26f}}{{Fn|42d}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 129~~

|-

|993.999.M41

|-

|994.999.M41

|[[Huron Blackheart]] crushes the [[Marines Errant]]. After drawing away most of their fortress-monastery's garrison, Blackheart's [[Night Lords]] allies infiltrate and bring down its static defenses. The [[Red Corsairs]] withdraw with nearly all of the chapter's [[gene-seed]] and relics, dooming the Marines Errant to a slow demise.{{Fn|25b}}{{Fn|42e}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 146~~

|-

|rowspan=2|995.999.M41

|Warmaster [[Abaddon]] launches the [[13th Black Crusade]]. The armies of Chaos Undivided lay siege primarily to [[Cadia]] but attack many of the surrounding worlds as well. Imperial Forces launch a massive counterattack, and eventually push back the tides of Chaos, but only just barely, and at great cost. The [[Space Wolves]]' [[13th Great Company]] are amongst the forces seen fighting against the forces of chaos. Major side battles include the [[Diamor Campaign]]{{Fn|25b}}{{Fn|42d}}|~~[[Warhammer 40,000 5th Edition Rulebook]], pg. 129~~

|-

|In [[Commorragh]], [[Khaine's Gate]] begins to fail

**{{Endn|2i}}: pgs. 119

**{{Endn|2j}}: pgs. 126–127

*~~{{Endn|~~3}}: [[Codex: Space Marines (5th Edition)]], **{{Endn|3a}}: pg. 30**{{Endn|3b}}: pgs. 36–37**{{Endn|3c}}: pgs. 38–39**{{Endn|3d}}: pg. 40**{{Endn|3e}}: pg. 48**{{Endn|3f}}: pg. 49

*{{Endn|4}}: [[White Dwarf 349 (UK)]], pg. 55

*{{Endn|5}}: [[Dataslate: Tyrannic War Veterans (Background Book)]], pg. 13

**{{Endn|35b}}: pg. 77

**{{Endn|35c}}: pg. 78

*{{Endn|36}}: [[Dark Heresy: Creatures Anathema]], pg. 11

*{{Endn|37}}: [[Warhammer 40,000: Compendium]], pg. 6

*38: [[Codex: Space Wolves (5th Edition)]]

**{{Endn|38a}}: pg. 18

**{{Endn|38b}}: pg. 19

**{{Endn|38c}}: pg. 20

**{{Endn|38d}}: pg. 21

*{{Endn|39}}: [[Codex: Eldar (6th Edition)]] pg. 22

*40: [[Codex: Space Marines (4th Edition)]]

**{{Endn|40a}}: pg. 20

**{{Endn|40b}}: Inside Back Cover

*{{Endn|41}}: [[Codex: Tau (3rd Edition)]], pg. 58

*42: [[Warhammer 40,000 5th Edition Rulebook]]

**{{Endn|42a}}: pg. 126

**{{Endn|42b}}: pg. 127

**{{Endn|42c}}: pg. 128

**{{Endn|42d}}: pg. 129

**{{Endn|42e}}: pg. 146

**{{Endn|42x}}: {{CME}}

*43: [[Codex: Necrons (5th Edition)]]

**{{Endn|43a}}: pg. 13

**{{Endn|43b}}: pg. 22

**{{Endn|43c}}: pg. 24

*44: [[Codex: Tyranids (5th Edition)]]

**{{Endn|44a}}: pgs. 8-9

**{{Endn|44b}}: pgs. 10-11

**{{Endn|44c}}: pgs. 16–17

**{{Endn|44d}}: pgs. 18–21

**{{Endn|44e}}: pg. 29

**{{Endn|44f}}: pg. 58

*45: [[Codex: Imperial Guard (5th Edition)]]

**{{Endn|45a}}: pg. 22

**{{Endn|45b}}: pg. 23

**{{Endn|45c}}: pg. 24

**{{Endn|45d}}: pg. 25

*46: [[Codex: Space Marines (3rd Edition)]]

**{{Endn|46a}}: pg. 36

**{{Endn|46a}}: pg. 39

**{{Endn|46a}}: pg. 47

*{{Endn|47}}: [[Rebel Winter (Novel)]], ''Hammer and Shield''

*{{Endn|48}}: [[Honour Guard (Novel)]]{{CME}}

*{{Endn|49}}: [[The Guns of Tanith (Novel)]], Prologue

*{{Endn|50}}: [[Straight Silver (Novel)]]{{CME}}

*{{Endn|51}}: [[Sabbat Martyr (Novel)]]{{CME}}

*{{Endn|52}}: [[Double Eagle (Novel)]]{{CME}}

*{{Endn|53}}: [[Traitor General (Novel)]]{{CME}}

*{{Endn|54}}: [[His Last Command (Novel)]]{{CME}}

*{{Endn|55}}: [[The Armour of Contempt (Novel)]]{{CME}}

*{{Endn|56}}: [[Tactica Imperialis (Background Book)]]{{CME}}

*{{Endn|57}}: [[Only in Death (Novel)]]{{CME}}

*{{Endn|58}}: [[Blood Pact (Novel)]]{{CME}}

*{{Endn|59}}: [[Salvation's Reach (Novel)]]{{CME}}

*60: [[White Dwarf 343 (UK)|White Dwarf 342 (US)]]

**{{Endn|60a}}: pg. 33 — ''"Timeline"''

**{{Endn|60b}}: pg. 37 — ''"Timeline"''

*{{Endn|61}}: [[Planetstrike]] pgs. 60-61

*{{Endn|62}}: [[The Warmaster (Novel)]]{{CME}}

*{{Endn|63}}: [[The Anarch (Novel)]]{{CME}}

*{{Endn|64}}: [[Codex: Sisters of Battle (5th Edition)]]{{CME}}

</div>

AndrewTJ31

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