First War for Armageddon - Invasion Commences: The war began within the hated region of space and the great Warp rift known as the Eye of Terror. The forces within, being devoted to the service of Chaos and the Ruinous Powers, usually fought against each other as was their fractious nature, but occasionally and inexplicably they put aside their rivalries to form an assault in the form of Chaos Undivided on their common enemy, the Imperium of Man. In this case, the unity of the powers of Chaos was triggered by the arrival of the Space Hulk Devourer of Stars around a Daemon World within the Eye of Terror that was controlled by the Daemon Prince and former Primarch Angron and his World Eaters Traitor Legion.Angron had spent much of the last 10 millennia attempting to restore some level of unity amongst the divided warbands of what had once been his XII Legion of Space Marines. The World Eaters' dedication to the Blood God Khorne during the Horus Heresy had reduced them for much of that time into a fractious force of Khornate Berserkers just as likely to kill each other as their true foes.The emergence of the Devourer of Stars into orbit around Angron's Daemon World provided just the opportunity he had been looking for to recreate some semblance of common purpose for his scattered Legion. The Space Hulk proved sufficiently large enough to carry huge numbers of Chaotic troops but only on an erratic course into realspace. This is how the Forces of Chaos unexpectedly emerged from the Warp aboard the Space Hulk in the Armageddon System in 444.M41.The arrival of Angron at Armageddon probably had nothing to with Angron's own desires, rather the location was determined by the chaotic currents of the Warp which sent his Space Hulk to Armageddon, possibly at the whim of one of the Gods of Chaos, probably Khorne, if there was any intent behind the Devourer of Stars ' course at all.Meanwhile, on Armageddon, a series of strange events culminated in an armed rebellion breaking out in half a dozen of the world's large hive cities against the Imperium's authority at the same time that massive Warp Storms cut off the world from Imperial communications and commerce. The revolts, largely initiated by Chaos Cultists taking advantage of food shortages caused by the Warp Storms to stir up trouble, were quickly put down on the eastern region of the world's southern subcontinent of Armageddon Secundus, but amongst the more widely scattered hives of the western region of the northern subcontinent of Armageddon Prime the rebels proved more difficult to eradicate.As Armageddon's Planetary Defence Forces (PDF) and the few regiments of the Imperial Guard's Armageddon Steel Legion present on the world seemed capable of dealing with the revolt, no additional units were sent by the Imperium to deal with the problem once the Warp Storms cleared. Armageddon was a very long way from the Eye of Terror in the galaxy's Segmentum Obscurus, and no one in the Imperium suspected any more sinister cause for the revolts than simple civil unrest.Busy containing the rebellion, the Imperial forces were caught by surprise when the Space Hulk Devourer of Stars suddenly emerged from the Warp in the Armageddon System.