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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'''===
...
===[[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}}
