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{{NightLordsPortal}}{{UltramarinesPortal}}{{Battle|Name =Battle of Tsagualsa|Image =|Image caption=|Conflict =[[Great Scouring]]|Date =After 032.[[M31]]{{Fn|4a}}|Location =[[Tsagualsan System]]{{Fn|1}}|Outcome =Imperial victory|Combatant1 =[[File:Aquila1transparent.png|30px]] [[Imperium]]|Combatant2 =[[Night Lords]]|Commanders1 =Unknown|Commanders2 =Many commanders, including:<br>[[Vandred Anrathi]]{{Fn|1}}<br>[[Talos Valcoran]]{{Fn|1}}|Strength1 =[[Ultramarines]]<br>[[Aurora Chapter]]<br>[[Praetors of Orpheus]]<br>[[Novamarines]]<br>[[Genesis Chapter]]<br>[[Silver Eagles]]<br>[[Black Consuls]]<br>[[Doom Eagles]]|Strength2 =Various warbands, including [[10th Company (Night Lords)|10th Company]]{{Fn|1}}|Casualties1 =Heavy|Casualties2 =Heavy}}The '''{{PAGENAME}}''' or '''Tsagualsa Retaliation''' was a battle of the [[Great Scouring]].{{Fn|1}}

Taking place decades after === Background ===The Night Lords were already breaking apart during the [[Horus Heresy]] and after , with many among their ranks creating [[Carrion Realms|petty warlord regimes]]. Only the death presence of their [[Primarch]] [[Konrad Curze]]and a select few commanders such as [[Jago Sevatarion]] kept most of the Legion together and suppressed the most blatant warlordism.{{Fn|1}} Yet the Legion's cohesion was broken at the end of the [[Thramas Crusade]], when only 60,000 of 100,000 Night Lords escaped [[Dark Angels]] ambushes at [[Sheol IX]] and [[Qetesh]]. Curze and Sevatarion went missing, and the battle saw Night Lords devolved into infighting raider warbands.{{Fn|3}} Following the [[UltramarinesSiege of Terra]] alongside their , the Imperium hunted the [[Second FoundingTraitor Legion]] descendants invade s. Most of the Traitors were driven into the [[Eye of Terror]] by 021.[[M31]].{{Fn|6}} Yet the Night Lordslargely remained within Imperial space, carrying out raids and ambushes which inflicted heavy losses on the Imperials.{{Fn|1}}{{Fn|7}} At some point after 032.[[M31]] acting homeworld ,{{Fn|4a}} Konrad Curze was reunited with the Night Lords Legion.{{Fn|4b}} Though the Primarch's sanity increasingly slipped away and the Night Lords Legion remained broken and dysfunctional, his presence resulted in the bulk of his sons rallying at a new base at [[Tsagualsa]] after years of raids from .{{Fn|4b}}{{Fn|5}} The planet was heavily fortified, with the Night Lords increasing their attacks into Imperial-controlled space.{{Fn|1}}{{Fn|5}} Ultimately Curze was slain by the [[Traitor AstartesCallidus Assassin]] [[M'Shen]],{{Fn|5}} whereupon the Night Lords once again squabbled among themselves. Faced with While most of the Legion continued operate from Tsagualsa and even increased the pace of its raids, a growing number of warbands broke away to pursue their own goals. Many Night Lords relocated to the Eye of Terror.{{Fn|1}} === Battle ===Years after Konrad Curze's death, the Imperium finally launched a combined invasion from massive offensive to end the threat posed by the Night Lords at Tsagualsa. For this purpose, the [[Ultramarines]], rallied their [[Second Founding]] descendants including the [[Aurora Chapter]], [[Praetors of Orpheus]], [[Novamarines]], [[Genesis Chapter]], [[Silver Eagles]], [[Black Consuls]], and [[Doom Eagles]].{{Fn|1}} The Ultramarines-led coalition made a surprise [[warp jump]] into the middle of the [[Tsagualsan System]], quickly engaging the Night Lords shattered fleet. Even though the Traitor armada was vast, the Imperial strength eclipsed it. Before long, the Traitor fleet was decimated and began to flee. On Tsagualsa itself, the Night Lords quickly realized that they could not hope to stop the invaders, and organized a fighting retreat - each warband on its own, with cohesion quickly breaking down.{{Fn|1}} Once they had broken through the Traitor fleet, the Imperials made planetfall on Tsagualsa. Even though the Ultramarines and their allies suffered heavy losses as they assaulted the Night Lords' main fortress, they rapidly broke into the complex and began to hunt down the local Traitors. [[Talos Valcoran]], the Night Lords' infamous prophet, was among those nearly killed in the operation, though [[First Claw|his squad]] managed to escape on a captured loyalist [[LegionThunderhawk]] and causing it to splinter into disparate warbandsflee the system under [[Vandred Anrathi]]'s command.{{Fn|1}} === Aftermath ===The Night Lords were left completely broken as a Legion after the Battle of Tsagualsa. They never again united in great strength.{{Fn|1}}