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From Warhammer 40k - Lexicanum
M41
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|The Liberation of [[Amadis]]: [[Regan Antigone]], the sole survivor of the [[Procell 1st Irregulars]], is hailed as the man who rallied and organized the defences that held off the final wave of the rebel attack before the [[Dark Angels]] arrive. He swears to never reveal the role or even the existence of the [[Cypher|robed figure]] who truly won the battle.{{Fn|107}}{{Fn|108}}
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|[[Orask Wars]]{{Fn|8d}}
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|[[Hive Fleet Pythos]] invades the [[Fortress World]] of [[Orask]] in the [[Ghoul Stars]]. The [[Red Talons]] Space Marines combat the hive fleet.{{Fn|132}}
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|138.997.M41
|[[Hive Fleet Leviathan]] contacts the galactic base of the Imperium, causing destruction in [[Segmentum Tempestus|Segmentums Tempestus]], [[UltimaSegmentum|Ultima]], and [[Segmentum Solar|Solar]].{{Fn|42c}}{{Fn|132}}
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|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}}{{Fn|73a}}
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|250.997.M41
|'''Slaughter of [[St Caspalen]]''': The [[Shrine World]] is invaded by Leviathan. A [[Deathleaper]] terrorizes the panicked populace, executing leaders. The [[Sisters of Battle]] hold out in their cloister for weeks, but are ultimately destroyed by a tunnelled ambush from below. This was a major blow to the faith of the Imperium. Showing faith alone is no defence against the Tyranids.{{Fn|132}}
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|302.997.M41
|The Leviathan [[Swarmlord]] earns its swiftest victories along the spine of worlds making up the [[Hodur Sector]] over the span of a single year. Dozens of worlds are absorbed, including the [[Storm Falcons]] homeworld, [[Talon]].{{Fn|132}}
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|310.997.M41
|[[Ksi'm'yen]] [[sept]] is established and used as a staging ground for the [[Third Sphere of Expansion]].{{Fn|29c}}
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|360.997.M41
|The supposedly impenetrable [[Iron Warriors]] fortress world of [[Forgefane]] falls to Leviathan in less than a week.{{Fn|132}}
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|400.997.M41
|'''[[Battle of Bloodstar]]:''' [[Battlefleet Ultima]] concludes a distastrous campaign against Leviathan. Pincered by two seperate Hive Fleets, the Battlefleet is ambushed in the [[Bloodstar Sector]] and the flagship ''[[Imperial Glory]]'' destroyed.{{Fn|132}}
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|498.997.M41
|The Mechanicus weapons testing facility of [[Tesla Prime]] is abandoned in order to use its military might bolster the defences of [[Gryphonne IV]] against the oncoming [[Hive Fleet Leviathan]].{{Fn|132}}
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|509.997.M41
|[[Leviathan]] invades [[Tarsis Ultra]]. A combined [[Mortifactors]] and [[Ultramarines]] strikeforce defeat a tendril of [[Hive Fleet Leviathan]] at [[Tarsis Ultra]]. {{Fn|42d}}{{Fn|3d}} Defence succeeds due to a biological plague created by [[Magos]] [[Locard]] delivered into the heart of the fleet by [[Uriel Ventris]].{{Fn|132}} The remainder of the Hive Fleet rampages on, completely unaffected.{{Fn|42d}}{{Fn|3d}} Any attempts to replicate a similar contagion have resulted in failure.{{Fn|132}}
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|[[Golgotha]]n refugees are slaughtered ''en masse'' by Dark Eldar raiders on the moon of Jagdor.{{Fn|42d}}
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|[[Inquisitor]] [[Krpytman]] orders the mass [[Exterminatus]] of hundreds of worlds to create a cordon to slow the advance of Hive Fleet Leviathan.{{Fn|132}}
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|433.998.M41
|The [[Red Waaagh!]]{{CME}}
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|[[Hive Fleet Leviathan]] invades [[Gryphonne IV]]. The world falls within days despite its military power being second only to [[Mars]] itself. This is a calamity of unprecedented scale for the [[Imperium]].{{Fn|132}}
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|755.998.M41
|A lone [[bio-ship]] launches an invasion of the planet [[Stormvald]]. The [[Phoenix Lord]] [[Maugan Ra]] stands alone against the swarm, and triumphs.{{Fn|132}}
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|757.998.M41
|The [[Third War for Armageddon]] begins. Having learnt 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}}{{Fn|86}}
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|854.998.M41
|Leviathan invades [[Shadowbrink]], annihilating all defenders and unwittingly triggering a [[daemonic incursion]].{{Fn|132}}
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|871.998.M41
|[[Galdemor]] is host to a three-way war between [[daemon]]ic legions of [[Slaanesh]], [[Khorne]], and [[Nurgle]]. Not a single soul survives.{{Fn|14c}}
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|932.998.M41
|[[Catachan Jungle Fighters]] combat Leviathan on the [[Death World]] of [[Jorn V]]. The outnumbered guardsmen prove rescourcesful and hold out long enough for additional [[Imperial Guard]] and Space Marine reinforcements to arrive planetside and strike a vital blow to the hive fleet.{{Fn|132}}
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|990.998.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}}
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|200.999.M41
|Kryptman leads a dangerous mission to the [[Labyrinth World]] of [[Carpathia]]. With the aid of several specially equipped [[Deathwatch]] teams, Kryptman successfully captures a live [[Genestealer]] brood in a [[stasis field]]. Many Space Marines die during Kryptman's gambit.{{Fn|132}}
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|[[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}}
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|550.999.M41
|[[High Marshall]] [[Helbrecht]] of the [[Black Templars]] leads a fleet of 15 Space Marine Chapters in pursuit of [[Ghazghkull Thraka]] and combats a splinter tendril of Leviathan barring his path. He exhausts every strategy he knows of, but his fleet is continually thwarted and pushed back. His mounting ire matches the rising number of Space Marines lost to Leviathan.{{Fn|132}}
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|561.999.M41
|[[Cypher]] eludes [[Belial]] for the third time on [[Piscina IV]].{{Fn|108}}
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|650.999.M41
|Kryptman and his allies board the [[space hulk]] ''[[Perdition's Flame]]'' and lodge his captured clutch of Genestealers aboard. He then order the destruction of the moon of [[Gheist]] in order to divert the space hulk's path into the system-wide Ork empire of [[Octarius]].{{Fn|132}}
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|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}}{{Fn|132}}
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|757.999.M41
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|[[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]]and halting the spread of Leviathan.{{Fn|42d}}{{Fn|3f}}{{Fn|132}}
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*{{Endn|130}}: [[White Dwarf 248 (AU)]] ''Heroic Actions of the Land Raider'', pgs. 96-97
*{{Endn|131}}: [[Codex: Iyanden]] (E-Book): pgs. 56-63 — ''Iyanden's Rise and Fall''
*{{Endn|132}}: [[Codex: Tyranids (6th Edition)]], pgs. 32-33 — ''The Third Tyrannic War''
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