The Black Templar and Blood Angel forces regrouped and after landing fresh troops, they began retaking the planet. The local ragtag guerrilla force joined the Space Marines and between them they cleansed the planet from Chaos infestation. Their last stronghold was the Dragon Keep, a fortified outpost protected by a force shield and surrounding the Aeldari Webway gate. The keep was held by a strong contingent of Alpha Legion Traitor Marines and what was left of the World Eater force, under the command of Agamemnon of the Alpha Legion.
At dawn, a Black Templar and Blood Angel force engaged the Dragon Keep. The force field proved to be almost impossible to penetrate and the attack seemed suicidal. The Traitors created a bloody killing zone in front of the keep. But the main assault was just a diversion as Thunderhawk gunships approaching from the other direction delivered a formidable force of jump pack equipped Assault Marines and the dreaded Death Company of the Blood Angels. The newly arrived Space Marines assaulted the unprepared Alpha Legion guarding the force field generator and destroyed it. Their main force rallied and pushed forward, breaking the Chaos line and trapped them in a deadly crossfire with their newly arrived brethren. The few Chaos marines that survived fled into the Webway gate. Before it closed a small force of Blood Angel scouts managed to slip in.