Immediately upon the death of Horus, the situation on Terra reversed completely. Every Daemon across Terra was sent back into the Warp as the Chaos Gods recoiled. Guilliman's fleet arrived in the Sol System, bringing massive amounts of reinforcements and beginning a vicious counterattack alongside Admiral [[Niora Su-Kassen]] and ''[[The Phalanx]]'', which emerges with its escorts from hiding within the rings of [[Saturn]] to attack the traitors. With their Primarch dead, the Sons of Horus fell into complete disarray and immediately broke, with Abaddon gaining some groups of survivors and fleeing aboard the ''Vengeful Spirit''. Many of the more corrupted traitor Space Marines died where they stood, while others fell into a fugue state. Panic broke out amongst the lesser followers of Chaos. Though massively outnumbered, the small group of loyalist survivors led a spiteful counterattack that chased the Traitors out of the Palace and soon all of Terra. Over the ensuing days the Traitors were completely routed.{{Fn|27h}} Isolated Traitor contingents would continue to resist for quite some time on Terra, with a sentient [[Obliterator Virus]] even unsuccesfully unsuccessfully attempting to turn the tide by spreading its infection from the Lion's Gate Spaceport to the arriving Ultramarines fleet.{{Fn|29}} While it is said that the Sons of Horus were the first Traitors to flee the Throneworld, the Death Guard were thought to be the last.{{Fn|6}}

The Horus Heresy did not end Amid the panicked retreats and final stands by the Traitors, the Ultramarines fleet arrived in orbit and began to obliterating their fleet, creating massive casualties. Guilliman set foot on the throneworld shortly after, meeting with the Battle surviving loyalist Primarchs: [[Rogal Dorn]], [[Jaghatai Khan]], [[Vulkan]], [[Leman Russ (Primarch)|Leman Russ]], and [[Lion El'Jonson]].{{Fn|31a}} They then drove what remained of the Traitors on Terra, and even before the fighting was done Guilliman and [[Rogal Dorn]] organized the [[Grand Council of Reconstruction]] within the ruined [[Imperial Palace]].{{Fn|31b}} Remaining pockets of Traitors attempted to sneak out of the System by mostly powering down their ships to avoid detection.{{Fn|31b}} Even as the Loyalists battled across Terraand its orbit, in the Council arose almost immediately. Rogal Dorn along with Leman Russ and The Loyalists still had Lion wished to drive conduct a swift and vengeful pursuit of the Traitors fleeing the remaining rebels from [[Sol System]], while Guilliman wished to consolidate their holdings and rebuild their strength while taking strategically important assets such as [[Luna]] and [[Mars]]. Ultimately, thanks to support by the Imperiumnewly empowered [[High Lords of Terra]], one world at a timeGuilliman's position prevailed and the Ultramarines focused on [[Retaking of Luna|retaking Luna]] while the Dark Angels cleared out the last pockets of resistance on Terra and the Space Wolves focused on securing the Sol System and [[Siege of Mars|besieging Mars]]. In what became {{Fn|31c}}  Eventually, in an event known as the [[Great Scouring]], the traitorous forces of Chaos Traitors were eventually driven wholly from the Imperium and into the [[Eye of Terror]].{{Fn|1e}}

==TriviaNotes=={{Trivia}}