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===Assault on Eydolim===For all of this blasphemy and desecration committed by Kor Megron and the [[Foresworn]], however, until the latter years of the [[41st Millennium]], they had still not achieved their greatest desire -- to undo their great works on ancient [[Eydolim]], to cast down its ancient glories, throw down the tarnished symbols of their devotion to the Emperor and slaughter all who stood in their way. In preparation of their grand offensive against the world of Eydolim, the Foresworn sought out alliances with scores of Chaos Space Marine warbands, calling upon blood-debts from ten thousand years of warfare and offering the choice of spoils to those who would join their cause. Through the sinister coordination of Kor Megron and the Foresworn, a mighty alliance of Chaos Space Marines and, later, their daemonic allies assailed Eydolim and the other nearby worlds. Such overwhelming assaults and universal cooperation is normally the province of a [[Black Crusade ]] -- that so many disparate Chaos Space Marine warbands answered the call speaks volumes of Kor Megron's powers of manipulation.

Help was at hand, however, as a sizeable portion of Crusade Group Black Gate was diverted from their mission to reinforce the Imperial efforts in the Damocles Gulf. A battle-ready contingent of Imperial Guard was hurried into the system, the Imperial battle fleet escorting the Imperial Navy's bulk transports to Eydolim before rushing off to harry the Chaos forces. The troops that arrived dramatically bolstered the under-manned Planetary Defence Forces and included nine regiments of [[Cadian ]] Shock Troops, as well as smaller dispositions of other Imperial Guard regiments such as [[Ventan Heavy Infantry]], [[Vostroyan Firstborn]], [[Valhallan Ice Warriors ]] and a company of [[Orn's World Militia]]. But soon a massive Chaos Space Marine flotilla appeared in high orbit over Eydolim. Bolstered by forces from the Black Legion, the Foresworn had returned after ten thousand Terran years to undo their folly. Together, the two legions of Chaos Space Marines forged onwards towards Eydol and the grand cathedrals there. All the time, more reinforcements arrived as [[Red Corsairs]], [[Night Lords ]] and other Traitors flocked to the cause. Against such fury, the Imperial Guard was grievously outmatched. Despite their losses, the heroism of the Imperial Guardsmen on Eydolim was astonishing. Even so, the Chaos Space Marines surged forwards, overrunning defences and smashing resistance as they closed in on the capital city. Whenever effective resistance was mounted, Kor Megron and his allies overcame it. The tactical wisdom and outright savagery of the Chaos Space Marines, veterans of countless wars, proved its worth against the brave men of the Imperial Guard over and over again. With the Chaos forces less than a day's travel from the capital of Eydol, and the Imperial Guard finding their every gambit overcome, the defenders looked heavenward in desperation -- and beheld a miracle.{{Fn|2}}

The scions of Ultramar had arrived -- the vaunted [[Ultramarines ]] 2nd Company, and a small force of 1st Company Veteran Marines, had been hastily diverted to Eydolim by their Chapter Master [[Marneus Calgar]]. Receiving his instructions with barely disguised enthusiasm, Captain Cato Sicarius, the leader of this relief force, had diverted his battle force with all haste. As the Chaos Space Marines swarmed towards the outer walls of Eydol, the Ultramarines would deploy en masse in support of the Imperial Guard and there, before the gates of the capital city, the Warriors of Ultramar would throw back the hordes of Chaos. For the forces of the Imperium, the frantic battle fought across the outer curtain wall of Eydol City is remembered as one of tragic loss and heroic sacrifice. Official Imperial records refer to it as the Battle of Eagle Gate -- a frenzied and violent engagement that left a battlefield littered with bodies and broken war engines and a sizeable portion of Eydol City's east quarter ablaze.{{Fn|2}}