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{{Quarantine Start}}
{{Battle
|Name = Horus Heresy
|Image = Horus vs The Emperor.jpg
|Image caption= The [[Emperor]] confronts [[Horus]] aboard the [[Vengeful Spirit]]
|Battles =
|Date =
|Location = [[Imperium]]
|Outcome = Pyrrhic Loyalist victory<br>
|Combatant1 = [[Imperium of Man|Loyalists]]
|Combatant2 = [[Chaos Space Marines|Traitors]]
|Commanders1 = [[Emperor of Mankind]] (WIA)<br>[[Malcador the Sigillite|Malcador]]†<br>[[Image:IF Icon.png|20px]] [[Rogal Dorn]]<br>[[Image:DA Icon.png|20px]] [[Lion El'Jonson]]<br>[[Image:WS Icon.png|20px]] [[Jaghatai Khan]]<br>[[Image:SW Icon.png|20px]] [[Leman Russ (Primarch)|Leman Russ]]<br>[[Image:BA Icon.png|20px]] [[Sanguinius]]†<br>[[Image:IH Icon.png|20px]] [[Ferrus Manus]]†<br>[[Image:UL Icon.png|20px]] [[Roboute Guilliman]]<br>[[Image:SAL Icon.png|20px]] [[Vulkan]]<br>[[Image:RG Icon.png|20px]] [[Corvus Corax]]<br>[[Constantin Valdor]]<br>[[Zagreus Kane]]<br>[[Jenetia Krole]]
|Commanders2 =[[Image:SOH icon.png|20px]] [[Horus Lupercal]]†<br>[[Image:EC Icon.png|20px]] [[Fulgrim]]<br>[[Image:IW Icon.png|20px]] [[Perturabo]]<br>[[Image:NL Icon.png|20px]] [[Konrad Curze]]<br>[[Image:WE Icon.png|20px]] [[Angron]]<br>[[Image:DG Icon.png|20px]] [[Mortarion]]<br>[[Image:TS Icon.png|20px]] [[Magnus the Red|Magnus]]<br>[[Image:WB Icon.png|20px]] [[Lorgar Aurelian]]<br>[[Image:AL Icon.png|20px]] [[Alpharius]]† / [[Omegon]]<br>[[Kelbor-Hal]]
|Strength1 =[[Image:DA Icon.png|20px]] [[Dark Angels]]<br>[[Image:WS Icon.png|20px]] [[White Scars]]<br>[[Image:SW Icon.png|20px]] [[Space Wolves]]<br>[[Image:IF Icon.png|20px]] [[Imperial Fists]]<br>[[Image:BA Icon.png|20px]] [[Blood Angels]]<br>[[Image:IH Icon.png|20px]] [[Iron Hands]]<br>[[Image:UL Icon.png|20px]] [[Ultramarines]]<br>[[Image:SAL Icon.png|20px]] [[Salamanders]]<br>[[Image:RG Icon.png|20px]] [[Raven Guard]]<br>Loyalist [[Imperial Army]]<br>[[Adeptus Mechanicus]]<br>[[Custodian Guard]]<br>[[Sisters of Silence]]
|Strength2 =[[Image:EC Icon.png|20px]] [[Emperor's Children]]<br>[[Image:IW Icon.png|20px]] [[Iron Warriors]]<br>[[Image:NL Icon.png|20px]] [[Night Lords]]<br>[[Image:WE Icon.png|20px]] [[World Eaters]]<br>[[Image:DG Icon.png|20px]] [[Death Guard]]<br>[[Image:TS Icon.png|20px]] [[Thousand Sons]]<br>[[Image:SOH icon.png|20px]] [[Sons of Horus]]<br>[[Image:WB Icon.png|20px]] [[Word Bearers]]<br>[[Image:AL Icon.png|20px]] [[Alpha Legion]]<br>Traitor [[Imperial Army]]<br>[[Dark Mechanicum]]<br>[[Daemons]]<br>[[The Lost and the Damned]]
|Casualties1 = Massive, Emperor forced to ascend to the [[Golden Throne]], <br>[[Sanguinius]] KIA, <br>[[Ferrus Manus]] KIA <br>[[Malcador the Sigillite|Malcador]] KIA
|Casualties2 = Massive, Traitors banished to the [[Eye of Terror]], <br>[[Horus Lupercal]] KIA<br>[[Alpharius]] KIA
}}
==Preliminary causes==
In addition, the Emperor's disciplining of [[Lorgar]] and the [[Word Bearers]] was a contributing factor to the Heresy and the event which set it directly into motion. After Lorgar and the entire Legion were publicly humiliated, scolded, and forced to kneel in front of the Emperor for spreading their belief that the ruler of mankind was a divine being, the pious Word Bearers felt betrayed and desperately sought any power in the universe to worship. This eventually led Lorgar and his Legionaries to the [[Eye of Terror]], where they pledged themselves to the forces of [[Chaos]] and began to conspire against the Emperor. Thus the Word Bearers had secretly become the first [[Chaos Space Marines]]. Secretly planning to make war on the Emperor, the Word Bearers quietly established [[Warrior Lodge]]s with their [[Chaplain]]s throughout the rest of the Astartes Legions. Though harmless at first glance, many of these lodges would become hotbeds of support for Horus' rebellion in the war to come.{{Fn|3}}'''MISSING SPECIFICATION'''
According to First Lord of the Imperium [[Malcador (Character)|Malcador the Sigillite]], the Heresy's causes may have been deliberately put into motion by both himself and the Emperor. According to Malcador, both deliberately agitated the Primarchs and turned them against one another, with the resulting war purging certain unmanageable Primarchs and their respective [[Space Marine Legion]]s just as they had the earlier [[Thunder Warrior]]s. This would lead humanity, not bio-engineered superhumans, as the rulers of the galaxy. However, the [[Ruinous Powers]] intervened before their plan could be fully formulated, leading to disaster in the [[Horus Heresy]]. This account may be either a partial or total lie, as Malcador himself seems to keep its validity ambiguous.{{Fn|15}}'''MISSING SPECIFICATION'''
==Horus's Corruption==
However, the Horus Heresy truly began after [[Warmaster]] [[Horus]] was wounded by the possessed [[Eugen Temba]] wielding the stolen [[Anathame]] on the moon of [[Davin]], a place that was cursed by the foul [[Chaos God]] [[Nurgle]]. The wound caused by the blade refused to heal, despite Horus's super-enhanced immune system or the efforts of the [[Sons of Horus]]'s best [[apothecaries]]. The [[Mournival]] took Horus to the Davinite [[Serpent Lodge]], which they were told could heal him. [[Erebus]] and the [[Word Bearers]] had orchestrated the battle on Davin, unknown to all involved.
During the rituals, Horus's spirit was transferred into the [[Warp]] where [[Erebus]], disguised as the Warmaster's closest friend [[Hastur Sejanus]], showed him a terrible vision of the very future which his actions would bring about - the [[Imperium]] as a repressive, violent, and superstitious regime where the [[Emperor]] and some of the [[Primarch]]s (but not Horus) were worshiped as divine beings by the fanatical and ignorant masses of humanity. The Chaos Gods portrayed themselves as the victims of the Emperor's psychic might who had no interest themselves in controlling the material world. Horus, already having grown jealous and deeply resentful of his perceived poor treatment at the hands of his father, the Emperor, and was one of many afraid of the concept of a peace where all for which that they had fought was given to weak willed men whilst his legions were cast aside and left as peacekeepers. Horus therefore proved all too willing to accept the Ruinous Powers' false visions of an Emperor determined to make himself a god at Horus's expense.
===[[Burning of Prospero]] (004.[[M31]])===
[[Image:Prospero-burns-cover-clean.jpg|thumb|right|250px|[[Leman Russ (primarch)|Leman Russ]] and the Wolves of Fenris march on [[Tizca]]]]
Magnus's brute force assault on the wards allowed the Warp and its myriad inhabitants [[War Within the Webway|to invade Terra]]. In the [[City of Sight]], the tremendous rush of raw psychic energy obliterated the Choir Primus and shattered nearly every whisperstone. Millions died as their minds were burned out or daemons tore them apart. Warp storms consumed entire settlements. Shockwaves flattened structures around the world{{Fn|5}}.'''MISSING SPECIFICATION''' Having already outlawed the Primarch's use of sorcery and refusing to believe that Horus, his most beloved and trusted son, would betray him, the Emperor instead perceived the traitor to be Magnus and his Legion. The Emperor ordered the Primarch [[Leman Russ (Primarch)|Leman Russ]] to mobilise his [[Space Wolves]] Legion and take Magnus into custody; Horus, however, persuaded Russ that Magnus was a threat and should not return to Terra alive. The Wolves of Fenris [[Battle of Prospero|descended upon Prospero]], destroying all in their path. Magnus, betrayed, defeated and forsaken by his beloved father, retreated into the Warp and pledged himself to [[Tzeentch]]. The Thousand Sons had never planned to join Horus, but the trap that the Changer of Ways had laid for the Red Sorcerer's legion led them to the Warmaster's side regardless. Meanwhile the catastrophe on Terra forced the Emperor to deal with a new [[War Within the Webway|crisis]] that consumed most of his attention. He led the [[Custodes]] and [[Sisters of Silence]] to deal with this, while he left management of the rebellion to [[Malcador (Character)|Malcador]] and [[Rogal Dorn]].{{Fn|6}}'''MISSING SPECIFICATION'''
===[[Battle of Isstvan III]] (005-006.[[M31]]){{Fn|39}}===
[[Image:Galaxy in flames clean.jpg|thumb|right|250px|The Luna Wolves battle the traitorous [[Death Guard]] in the [[Battle of Isstvan III]]]]
[[Image:HHTraitors.jpg|thumb|right|The Court of Horus at the height of the Heresy. From left to right: [[Erebus]], [[Kelbor-Hal]], [[Maloghurst]], [[Abaddon]], [[Horus]], [[Red Angel]], [[Ahriman]], [[Ingethel]], [[Fulgrim]] ]]
===The Formation of [[Imperium Secundus]] (009-011.M31)===
[[Image:Unremembered.jpg|thumb|right|250px|[[Roboute Guilliman]] proclaims [[Sanguinius]] as ''Imperator Regis'' of [[Imperium Secundus]]]]
Despite the traitor defeat on Calth, [[Erebus]] was successful in creating the [[Ruinstorm]] which threw the [[Astronomican]] into disarray and rendered navigation and communication difficult. The Blood Angels and Dark Angels under their respective Primarch's sought Terra, but were unable to navigate the Ruinstorm and instead locked onto the [[Pharos]] beacon, ending up in the Realm of [[Ultramar]] instead. As a result, [[Roboute Guilliman]] feared the Imperium lost and created a second empire, [[Imperium Secundus]], as a contingency with [[Sanguinius]] as its ''Imperator Regis'' and [[Lion El'Jonson]] as its Lord Protector.{{Fn|6}}'''MISSING SPECIFICATION''' Early tests for Imperium Secundus came from both the [[Battle of Sotha]] and the unleashing of [[Konrad Curze]] on [[Macragge]].
===The Path of Heaven===
[[Image:JagathaivsKeeper.jpg|thumb|right|250px|[[Jaghatai Khan]] and the [[White Scars]] Legion fight against [[Slaanesh]] [[daemon]]s on their way to Terra]]
After the discovery of the [[Dark Glass]] and the subsequent [[Battle of Catallus]], the [[White Scars]] managed to return to Terra to defend the capital world with their force{{Fn|4}}'''MISSING SPECIFICATION'''.
==Final Phase (010-014.M31)==
===The [[Solar War]] (010-014.M31)===
After years of bitter fighting, Horus and his forces finally arrived at [[Terra]], capital of humanity. For several years previous, traitors had been wresting control of the [[Sol System]] from the [[Imperial Fists]] in the [[Solar War]]. During these battles, the [[Alpha Legion]] [[Battle of Pluto|struck at Pluto]] and [[Alpharius]] himself was seemingly killed by [[Rogal Dorn]].{{Fn|13}}'''MISSING SPECIFICATION'''
===The Dissolution of [[Imperium Secundus]] (011.M31)===
The Imperium Secundus was constantly undermined thanks to the political clashes between Guilliman and Lion El'Jonson, with Sanguinius proving unable to negotiate settlements between the two.{{Fn|19}} Due to the visions of both [[Sanguinius]] and [[Konrad Curze]] of the Emperor, it became apparent that he still lived and Terra still endured. This, along with the many disagreements between its ruling triumvirate, resulted in the dissolution of [[Imperium Secundus]]. Sanguinius, [[Roboute Guilliman]], and [[Lion El'Jonson]] attempted to breach the [[Ruinstorm]] to reach Terra, but in the end [[Second Battle of Davin|only Sanguinius and the Blood Angels were successful]].{{Fn|14}}'''MISSING SPECIFICATION'''
===The [[Battle of Trisolian]] and the [[Battle of Yarant|Wolf Cull]] (012.M31)===
Shortly after the arrival of Sanguinius on Terra, [[Leman Russ (Primarch)|Leman Russ]] left with the intent on confronting Horus himself. Thanks to runes planted by infiltrating [[Knights-Errant]] during the [[Battle of Molech]] the Space Wolves were able to track the location of the ''[[Vengeful Spirit]]'', and Russ and Horus [[Battle of Trisolian|engaged one another in a duel as battle raged around them]]. Russ was badly wounded, but in turn wounded Horus with the [[Spear of Russ]], cleansing much of the corruption that had befallen the Warmaster since [[Molech]]. However the battle cost the Space Wolves dearly, and they fled to [[Yarant]] with Russ in a comatose state.{{Fn|16}} The Wolves narrowly [[Battle of Yarant|avoided destruction]] at the hands of Sons of Horus [[First Captain]] [[Ezekyle Abaddon]] thanks to Corax and the Raven Guard.{{Fn|16}}'''MISSING SPECIFICATION'''
==The Muster on Ullanor and Lorgar's coup (013.M31)===
After the titanic [[Battle of Beta-Garmon]], Horus' fleet was within range of the [[Sol System]] and mustered their forces on [[Ullanor]]. Horus during this time was still suffering wounds inflicted by Russ at the [[Battle of Trisolian]], and the traitor war effort would have fallen apart had it not been for [[Maloghurst]] who gave his life to restore the Warmaster. During the muster of the Traitor Primarch's at Ullanor, [[Lorgar]] revealed that he saw Horus as weak and doomed to fail and attempted to usurp him. However Horus defeated the coup, and exiled Lorgar from his sight. Alpharius apparently quit the traitor war effort after giving the Warmaster a detailed map of the Sol System defenses, but Horus still mustered Angron, Magnus, Perturabo, and Fulgrim to his side on Ullanor as well as forces from the Night Lords and Word Bearers.{{Fn|17b}}'''MISSING SPECIFICATION'''
===[[Battle of Beta-Garmon]] (012-013.M31)===
[[Image:Titandeath.jpg|right|thumb|250px|Titans battle in the Beta-Garmon campaign]]
Horus' armies had by now finally arrived at the gates of the [[Sol System]], and sought to move onto the Imperium Throneworld. However to do this, they would first have to capture the strategically vital [[Beta-Garmon Cluster]]. The resultant [[Battle of Beta-Garmon]] was one of the largest of the Heresy, seeing massive casualties on both sides. Particularly hard hit were the [[Titan Legion]]'s, which led to the battle being referred to as the '''Titandeath'''. However in the end Horus' forces prevailed, despite the Warmaster himself falling to wounds inflicted at [[Battle of Trisolian|Trisolian]] by [[Leman Russ (Primarch)|Leman Russ]].{{Fn|17a}}'''MISSING SPECIFICATION'''
===The [[Siege of Terra]] (014.M31)===
[[Image:Visions-large.jpg|thumb|right|300px|Horus and the Emperor battle on the Vengeful Spirit]]
In 0000014.[[M31]], the first day of Primus, Horus' armada at last arrived at the [[Sol System]]. During the final intense phase of the [[Solar War]], the traitors captured the Solar System from loyalist forces despite the best efforts of [[Rogal Dorn]] to stall until the arrival of reinforcements from [[Roboute Guilliman]] and [[Lion El'Jonson]].{{Fn|25}} Once within range of Terra, Horus and his forces destroyed [[Luna]]'s naval bases and within thirty days had destroyed the Terran system's defences. Terra was bombarded and devastated. The corrupted Marines from the Sons of Horus, Death Guard, World Eaters, Emperor's Children, Iron Warriors, Thousand Sons, Word Bearers, and Night Lords eventually landed on Terra, experiencing heavy resistance from the defenders which were led by the Imperial Fists, Blood Angels, and White Scars. Vast amounts of traitor Imperial Army, [[Dark Mechanicum]], [[Chaos Cult]]ists, and [[Daemon]]ic forces joined the traitor Astartes in their assault on Terra. The loyalists were outnumbered and the battle for Terra turned into a siege of the [[Imperial Palace]]. By the fifty-fifth day the rebels had reached the walls of the Inner Palace but Sanguinius managed to hold the [[Eternity Gate (Imperial)|Eternity Gate]] despite a vicious assault led by the [[Bloodthirster]] [[Ka'Bandha]]. Eventually a stalemate set in with not even the siegecraft of Perturabo and the Iron Warriors being able to break the tide. Horus, who had remained in orbit aboard his battle barge, was at that point warned that the Ultramarines and Dark Angels were returning to Terra and would arrive shortly. If this were to happen, Horus's advantage in numbers would be eliminated and he faced the prospect of attacks to his rear. In a final gambit he deactivated the [[Void Shield]]s protecting the ''Vengeful Spirit'' to lure the Emperor in a final battle that would decide the war.{{Fn|2e}} At the same time, [[Typhus]] led a [[Death Guard]] assault against the [[Astronomican]], seeking to stop its reactivation by [[Corswain]] and his [[Dark Angels]] as well as [[Euphrati Keeler]] and [[Sigismund]].{{Fn|}}
==Aftermath==
The Emperor's final command began the [[Great Scouring]]. Under the leadership of the remaining loyalist Primarch's the forces loyal to Horus were hounded into the [[Eye of Terror]] and locations such as the Isstvan System sterilized. All records and the remaining homeworlds of the traitor legions were destroyed. Inside the Eye, the remaining Traitor Primarch's, now nearly all [[Daemon Prince]]s, became detached from the affairs of the [[Materium]] and let their children fend for themselves.{{Fn|21}} Without the Primarchs, the traitor legions themselves engaged in a bitter [[Legion Wars|civil war]] until [[Ezekyle Abaddon]], assuming the epithet "the Despoiler," would become closest the traitor legions would have to a unified leader and lead a number of [[Black Crusade]]s into the Imperium in the millennia to come.{{Fn|20}}'''MISSING SPECIFICATION'''
Ultimately, the Horus Heresy was instrumental for the ten-thousand year decay that has since set into the Imperium. The Emperor's grand ambition, the [[Webway Project|Imperial Webway]], was abandoned and [[Chaos]] continued to plague humanity. The hope and reason of the [[Imperial Truth]] was gradually replaced by the repression and superstition of the [[Imperial Cult]] which now worships the Emperor, still kept alive upon the Golden Throne through the daily sacrifice of a thousand [[Psyker]]s, as a god.{{Fn|24}} Technologies from the Great Crusade era were lost over time, and eventually even the Heresy itself became the subject of myth to the citizens of the Imperium.
===[[Signus Campaign]] (004-006.[[M31]])===
[[Image:SignusArt.jpg|thumb|right|250px|[[Sanguinius]] and [[Ka'Bandha]] battle on Signus Prime]]
At the [[Signus Cluster]] [[Sanguinius]] and the [[Blood Angels]] narrowly avoided corruption at the hands of Daemonic forces under [[Kyriss the Perverse]] and [[Ka'Bandha]].
===Flight of the ''Eisenstein''===
{{main|Eisenstein}}
The seventy Loyalists led by Captain Garro commandeered the Imperial frigate ''Eisenstein'' and evading the forces of Horus, were able to escape from the Isstvan system into the Immaterium. The ''Eisenstein'' was badly damaged during its escape from Isstvan III; all its [[astropath]]s were dead and its lone [[navigator]] was mortally wounded. However, Garro managed to attract the attention of passing loyalist ships by setting the vessel's warp engines to self-destruct and ejecting them from the ship. Rogal Dorn's Imperial Fists Legion had been becalmed in the Warp with its fleet for some time and his navigators sensed the detonation of the ''Eisenstein'''s Warp drives. Making an immediate course for the location of the ship's beacon, Dorn met with Garro, who explained to him all that had happened with the traitor legions.{{Fn|28}}'''MISSING SPECIFICATION'''
The remaining crew of the ''Eisenstein'', now aboard Primarch Dorn's fortress-monastery ''[[Phalanx]]'', was able to reach Terra (after Dorn's fleet destroyed the ''Eisenstein'' to ensure no Chaos taint remained), allowing the loyal marines to report the extent of the atrocities that had occurred in the Isstvan system. It was said in later millennia that without this warning, the Imperium would have faced even greater difficulties in responding to Horus's next moves although his warning may have enabled Horus to enact the drop site massacre.{{Fn|28a}}'''SOURCE NOT SPECIFIED'''
The fate of these seventy marines is ultimately unknown. Some believe they continued to fight for the Emperor until death claimed them, while others maintain that they were treated as if they were their traitorous brethren, either imprisoned and left to rot or executed. Others believe that Captain Garro, shocked by the terrible betrayal, became an [[apothecary]], vowing never to kill again. Others believe some of these men formed the nucleus of the elite Space Marines Chapter later known as the [[Grey Knights]], for [[Malcador (Character)|Malcador the Sigillite]] had presented eight of the survivors to the Emperor before his departure. These men were gifted [[psyker]]s, came from the ranks of the Legions that had turned traitor, and yet maintained both an unbreakable faith in the Emperor and talent for resisting the temptations of Chaos.
===[[Schism of Mars]] (005-006.[[M31]])===
[[Image:MechanicumCover.jpg|thumb|right|250px|Battlefield Mars]]
The damage of the scrapcode causes the devastation of the majority of the installations and disrupts the planet's communications. Within the confusion, the [[Dark Mechanicum]] begins the conquest of the planet. However, they discovered that some [[Forges]] remain relatively intact due to his more advance security system. The traitor forces begin the assault against the pockets of resistance with the immediate siege of one of these Forges, leaded by [[Ipluvien Maximal]]. Owerhelmed after resisting for some time, the Tech-Priest detonated the reactors of his own forge to deny the victory of the traitors. In a brief time all Mars became a bloody battlefield where the devastation of the battles costs a great damage of the industrial infrastructure and the repository of knowledge of the planet.{{Fn|30}} '''MISSING SPECIFICATION'''
Another of the main forges that resisted the scrapcode's attack was the [[Magma City]], leaded by [[Koriel Zeth]], a loyal member of the Mechanicum. [[Kelbor-Hal]] to justify his attack against the forge, declares Koriel an heretic for her denial of the [[Machine God]] cult. After resisting the first attacks, She was owerhelmed by the traitors and, such as Maximal, she decided to detonate her own forge to deny its use by the traitors.{{Fn|30}}'''MISSING SPECIFICATION'''
After this combats, the loyal forces were reinforced with four companies of the [[Imperial Fists]] Legion and imperial army auxiliar, leaded by [[Captains]] [[Sigismund]] and [[Camba-Diaz]].{{Fn|30b}} However, due to the great numbers of the [[Dark Mechanicum]] forces, it was impossibile to turn the tide of the battle. After acknowledge the situation, [[Sigismund]] orders the loyal forces to take all munitions, armors and equipment possible with them before evacuate the remaining loyal forces from the planet.{{Fn|30}} '''MISSING SPECIFICATION'''
===[[Drop Site Massacre]] (006.[[M31]])===
[[Image:Fulgrim clean.jpg|thumb|right|250px|The Drop Site Massacre]]
After ridding himself of all suspected loyalist members within the three Legions under his direct command, Horus chose Isstvan V as his command post and prepared a trap for his former brothers and their Legions.
Ferrus Manus engaged Fulgrim in personal combat, only to die at his hands while the Emperor's Children butchered the Iron Hands. The loyalists retreated towards the apparent safety of their brothers in the second wave, hoping to gain reinforcement; what happened next took them completely by surprise. The four Legions of the second wave - The [[Night Lords]] of [[Konrad Curze]], the [[Iron Warriors]] of [[Perturabo]], the [[Word Bearers]] of [[Lorgar]], and the [[Alpha Legion]] of [[Alpharius]] — already seduced to the cause of Horus, opened fire on their unsuspecting brothers, slaughtering them wholesale. This orgy of carnage would later become widely known as the ''Istvaan V Drop Site Massacre''. A phrase attributed to the Warmaster himself can easily summarise the entire battle: '''"When the traitor's hand strikes, it strikes with the strength of a Legion."''' After the battle, Fulgrim presented the head of Ferrus Manus to Horus as a trophy.
==The Rebellion Spreads==
[[Image:HH006-010.M31.jpg|thumb|center|400px|Horus' Rebellion spreads across the Imperium]]
===[[Invasion of Paramar V|Wars For Paramar]] (006-011.[[M31]]{{Fn|39}})===
After the victory of the [[Drop Site Massacre]], [[Horus]] orders his forces to capture the world of [[Paramar V]] for its strategic position. The world, laid on the northern edge of [[Segmentum Solar]], was a staging area for Expeditionary Fleets during the [[Great Crusade]] and its conquest was a first step of the Warmaster’s campaign against [[Terra]].
The forces of the Warmaster, consisted in elements of the [[Alpha Legion]], [[Legio Fureans]] and [[Dark Mechanicum]], launch an invasion of the planet. After an initial bloody combat, the traitors seized most of the planet with the conquest of the Landing Zone Secundus. However, the loyalists defenders, formed from the loyal 77th [[Grand Company]] of the [[Iron Warriors]], [[Legio Gryphonicus]] and [[Mechanicum]] forces, make a stubborn defence on the primary spaceport and take heavy losses to [[Legio Fureans]]. The defence of the loyalist lasts until the second attack of the [[Alpha Legion]], who turns the tide of the battle and conquers the last bastion of the loyalist, securing the planet for Horus.
===The [[Siege of Cthonia]] (006-014.[[M31]])'''UNSOURCED DATE'''===
===[[Manachean War]] (006-008.[[M31]])'''UNSOURCED DATE'''===
===[[Battle of Phall]]'''UNSOURCED DATE'''===
[[Image:Shadows_of_treachery_cover_clean.jpg|thumb|right|250px|The [[Imperial Fists]] and the [[Iron Warriors]] in battle over the Phall system]]
===[[Battle of the Alaxxes Nebula]]'''UNSOURCED DATE'''===
===[[First Siege of Hydra Cordatus]] (~007.[[M31]])'''UNSOURCED DATE'''===
=== [[Furious Abyss]] and [[Battle of Calth]] (007.[[M31]])'''UNSOURCED DATE'''===
[[Image:Guilliman space battle.jpg|thumb|right|250px|[[Roboute Guilliman]] takes the battle to the void above Calth]]
During the developments at [[Prospero]], Horus's rebellion would be further strengthened by Magnus the Red and his Legion, the [[Thousand Sons]], now servants of [[Tzeentch]]. With nine Legions and much of the [[Adeptus Mechanicus]] behind him, Horus quickly struck towards Terra after gaining the powers of the Emperor after the [[Battle of Molech]].
Meanwhile in [[Ultramar]], the [[Word Bearers]] under [[Lorgar]] launched a devastating surprise attack against the [[Ultramarines]] as the gigantic [[Battleship]] ''[[Furious Abyss]]'' attempted to attack [[Macragge]]. While the Ultramarines took grievous losses at Calth, the ''Furious Abyss'' was destroyed and the [[Space Marine Legion|Legion]] survived. [[Roboute Guilliman]] would now have to contend with the [[Shadow Crusade]] of the [[Word Bearers]] and [[World Eaters]].{{Fn|36}}'''MISSING SPECIFICATION'''
===[[Thramas Crusade]] (007-010.M31){{Fn|39}}===
To hold up [[Lion El'Jonson|The Lion]], Horus dispatched the [[Night Lords]] to rampage throughout the Imperium to draw the attention of his [[Dark Angels]] in the [[Thramas Crusade]].
===[[Shadow Crusade]] and [[Crusade of Iron]] (007-009.M31)'''UNSOURCED DATE'''===
[[Image:Betrayer final.jpg|thumb|right|250px|[[Lorgar]] and [[Angron]] with their legions fight against the [[Ultramarines]] during the [[Shadow Crusade]]]]
==The Khan's Decision (007.M31)'''UNSOURCED DATE'''==
[[Image:Scars cover.jpg|thumb|right|250px|[[Jaghatai Khan]] and the [[White Scars]] Legion]]
To occupy the bulk of remaining loyalist forces, Horus commanded the [[Alpha Legion]] to bog down the [[Space Wolves]] and to jam the communications of the [[White Scars]], who were unaware of the Heresy, fighting in a long campaign against the orks of the [[Chondax System]]. For this purpose the [[Alpha Legion]] uses a strange [[pylon]], located on the [[Tenebrae 9-50]] Installation in the [[Octiss System]], to manipulate the Warp and the communications of the Vth Legion. However, the plan failed when Omegon dispatched a small team, leaded by [[Sheed Ranko]], to neutralise the device. This action let the White Scars to recover their communications with the rest of the Imperium and discover the news of the Heresy.
===[[Capture of the Perfect Fortress]] (008.M31)'''UNSOURCED DATE'''===
===[[Mezoan Campaign]] (008.M31)'''UNSOURCED DATE'''===
===The [[Siege of Baal]] (008-013.M31)'''UNSOURCED DATE'''===
===The [[Battle of Vanaheim]] (008-009.M31)'''UNSOURCED DATE'''===
===The [[Breaking of Anvillus]] (009.M31)'''UNSOURCED DATE'''===
===[[Battle of Molech]] (009.M31)'''UNSOURCED DATE'''===
Following the [[Battle of Dwell]] and a failed assassination attempt on [[Horus]] by [[Shadrak Meduson]], the traitor Warmaster regained memories sealed by the Emperor regarding the world of [[Molech]]. Horus speculated that great power lay on Molech, and wished to claim it in order to usurp his father. In the [[Battle of Molech|subsequent battle]], Horus gained access to a [[Warp]] gate and gained radical new psychic abilities.{{Fn|35}}'''MISSING SPECIFICATION'''
===The Formation of [[Imperium Secundus]] (009-011.M31)'''UNSOURCED DATE'''===
===The [[Siege of Inwit]] (009-013.M31)'''UNSOURCED DATE'''===
===The [[Battle of Tallarn]] (010-012.M31)'''UNSOURCED DATE'''===
[[Image:TallarnBattle2.jpg|right|thumb|250px|The Battle of Tallarn]]
Perturabo [[Battle of Tallarn|invaded]] the world of [[Tallarn]], beginning one of the largest armored conflicts in galactic history.
===[[Nocturne]] and the Journey of [[Vulkan]] (~010.M31)'''UNSOURCED DATE'''===
===The [[Cataclysm of Iron]] (012-015.M31)'''UNSOURCED DATE'''===
==Final Phase (010-014.M31)'''UNSOURCED DATE'''==
===The [[Solar War]] (010-014.M31)'''UNSOURCED DATE'''===
...
===The Dissolution of [[Imperium Secundus]] (011.M31)'''UNSOURCED DATE'''===
...
===The [[Battle of Trisolian]] and the [[Battle of Yarant|Wolf Cull]] (012.M31)'''UNSOURCED DATE'''===
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===[[Battle of Beta-Garmon]] (012-013.M31)'''UNSOURCED DATE'''===
...
===The Lion's Purge (012-013.M31)'''UNSOURCED DATE'''===
===The Muster on Ullanor and Lorgar's coup (013.M31)'''UNSOURCED DATE'''===
===The Fall of the Death Guard (013-014.M31)'''UNSOURCED DATE'''===
Meanwhile, Mortarion and the Death Guard were fully corrupted inside the [[Warp]] by [[Nurgle]] thanks to sabotage by First Captain [[Calas Typhon]]. When the re-emerged from the Warp in the Sol System, they had become a horrifying army of [[Plague Marines]].{{Fn|2}}'''MISSING SPECIFICATION'''
===The [[Siege of Terra]] (014.M31)'''UNSOURCED DATE'''===
*{{Main|Siege of Terra}}
{{Quarantine End}}
==Alleged sources containing relevant information==
*[[Horus Heresy (Artbook Series)]], pg. 101
==Old talk==
I know there is already a citation being called for but this "Mortarion, already a close friend of his brother's, was too easily persuaded, having been turned long before the Heresy through the efforts of his first captain Calas Typhon." The IA, I believe, states that Mortarion and his legion minus Typhus turned after they became stranded in the warp. And that was after the Istvann massacre IIRC
I remember reading somewhere that the emperor did not wish to truly fight Horus until he found the body of Sanguinius and he witnessed Horus slay one of the Custodes. [Though I also have heard in the original telling it was not a Custode but a Guardsman captain though for the life of me I can not think of his name] and it was actually seeing Horus commit that act which the Emperor realized that his son was lost. Are ether of these account correct? if so do they bare mentioning in the entry? --[[User:Dragonsamurai7|Dragonsamurai7]] 11:13, 29 October 2010
:They can only be entered with correct official sourcing. --[[User:Inquisitor S.|Inquisitor S., Großmeister des Ordo Lexicanum]] 15:21, 29 October 2010 (UTC)
==Drop Site Massacre==
In editing the 'Drop Site Massacre' section a question has arisen. From the description, the SM forces dispatched by the Emperor totaled 7, 3 loyalist (Iron Hands, Salamanders, Raven Guard), and 4 traitor (Word Bearers, Night Lords, Iron Warriors, Alpha Legion).
Why then are there '5' legions escaping Istvaan V? --[[User:Anoctris|Anoctris]] 08:21, 12 February 2011 (UTC)
:Maybe a typo or error. Grab a footnote and burn that heretic sentence ;-) --[[User:DetlefK|DetlefK]] 16:43, 12 February 2011 (UTC)
I just saw that this whole section is unsourced and differs in several key points from the description in the novel Fulgrim. --[[User:DetlefK|DetlefK]] 16:47, 12 February 2011 (UTC)
I have no idea where it's been sourced, before I edited it reminded me of sections form the ''Visions of '' background books (I only have 2 of 3). I've only just finished reading Horus Rising so I have no idea if the infos correct.--[[User:Anoctris|Anoctris]] 05:55, 13 February 2011 (UTC)