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At Gorgon Bar, [[Blood Angels]] Primarch [[Sanguinius]] and [[Imperial Fists]] Captain [[Fafnir Rann]] oversaw the defenses against a large [[Iron Warriors]]-led assault under [[Yzar Chroniates]], [[Ormon Gundar]], and [[Bogdan Mortel]].{{Fn|13b}} During the battle, Sanguinius destroyed a [[Warlord Titan]] of the [[Legio Vulpa]] by boarding its head and impaling it with the [[Spear of Telesto]]. Such was the spectacle that three accompanying traitor [[Warhound Titan]]s fled from Sanguinius' sight.{{Fn|13a}} Thanks to the inspiration provided by Sanguinius, the traitor assault at Gorgon Bar was broken when the defenders drove the Iron Warriors from the towers of the Fourth Circuit Wall.{{Fn|13b}} At the Colossi Gate, the defenders were led by Primarch [[Jaghatai Khan]], Blood Angels [[First Captain]] [[Raldoron]], [[Marshal]] [[Aldana Agathe]], and [[Custodes]] [[Captain-General]] [[Constantin Valdor]]. Not wanting to wage a purely defensive war and wishing to eventually retake the Lion's Gate Spaceport, Jaghatai Khan led a 300-strong [[Jetbike]] charge from the Colossi Gate that devastated [[Death Guard]]-led forces until at the last moment the White Scars withdrew back to their own lines.{{Fn|13c}} [[Magnus]] and [[Ahriman]] along with a cabal of [[Sorcerers]] from the [[Order of Ruin]] subsequently launched a psychic assault on the defenders, sapping their will to fight and summoning vast amounts of [[Daemon]]s including eight gigantic [[Warhound Titan]]-sized monsters{{Fn|13f}}. However thanks to the defensive storms erected by Jaghatai Khan's [[Stormseer]]'s led by [[Naranbaatar]], the loyalists were able to hold the line.{{Fn|13d}}

With the tacit approval of Perturabo, Sons of Horus First Captain [[Abaddon]] led a massive assault on the Saturnine Gate, hoping to exploit the flaw observed there. At the Saturnine Gate, three [[Donjon Pattern Siege Engine]]s led the attack, which consisted of the full strength of the [[Emperor's Children]] (some 100,000 Space Marines) under [[Fulgrim]] himself.{{Fn|13d}} Meanwhile, Abaddon himself alongside [[Horus Aximand]], [[Falkus Kibre]], and [[Tormageddon]] led a spear-tip assault from [[Mantolith]] and [[Plutona]] assault drills beneath the Saturnine Gate, hoping to exploit the gap. His forces consisted of not only the elite [[Justaerin]] and [[Reaver Attack Squad]] but also the 18th and 25th Companies under [[Tybalt Marr]] and [[Lev Goshen]].{{Fn|13e}} However Dorn was ready for them, and organized a series of kill-teams under [[Garviel Loken]] and [[Nathaniel Garro]] to ambush the traitors as they emerged from beneath the earth. In addition, [[Arkhan Land]] was able to fill the breach with fast-drying sealant, entombing many traitors beneath the walls, including the majority of 25th Company and Goshen. In a series of brutal massacres, the Sons of Horus were beaten back and Aximand, Kibre, and Tormageddon were all slain. Abaddon himself barely escaped with his life after reluctantly ordering a withdrawal. Above, Fulgrim and the Emperor's Children wreaked havoc but the Imperial Fists defenders were able to use their defenses to hold back a force ten times their size. Dorn himself soon arrived, briefly battling Fulgrim before the Phoenician learned the subterranean assault had failed and now fed up with his traitor allies, left the battlefield. However before Fulgrim departed, he summoned his elite guard under Eidolon to kill Dorn. The Primarch alongside [[Sigismund]] were able to defeat Fulgrim's assassins as the Emperor's Children retreated after taking 18,000 casualties.{{Fn|13e}} Fulgrim and the Emperor's Children had grown bored of the stalemate and set off on a bloody orgy against the people of Terra of such depravity and destruction that ten thousand years later, Terrans are still distrustful of Space Marines.{{Fn|1c}}

Despite the decisive victory at the Saturnine Gate and the defensive successes in holding Gorgon Bar and Colossi, just as Dorn predicted the Eternity Wall Spaceport was doomed. Defenders in the area were led by Imperial Fists Captain [[Camba Diaz]], [[White Scars]] Captain [[Shiban Khan]], [[General|High Primary Solar General]] [[Saul Niborran]], and [[Sisters of Silence]] Commander [[Jenetia Krole]]. The commanders knew that Dorn had no intent of reinforcing them, but not wishing to abandon their doomed troops did not evacuate. Camba Diaz died slaying scores of traitors on the Pons Solar bridge, refusing to take a step back.{{Fn|13f}} Shortly after [[Angron]] himself arrived, and in a moment of clarity requested the surrender of Space Port. Niborran and his [[Imperial Army]] troopers responded by blasting Angron to pieces with the Port's gun batteries, though the traitor Primarch quickly regenerated.{{Fn|13g}} Niborran and his men alongside Krole all fought to the death against a savage [[World Eaters]] assault led by Angron, [[Kharn]], and [[Khornate]] [[Titan]]s. Shiban Khan was thought slain in a shuttle crash while trying to help the last Imperial Army troopers under his command evacuate. Meanwhile at the edge of the [[Sol System]], a contingent of 10,000 [[Dark Angels]] under Captain-Paladin [[Corswain]] arrived to help defend Terra.{{Fn|13e}}

===Magnus' Infiltration===