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The grey and gold [[Regiments]] were among the [[Imperial]] forces that defended the [[Ultramarines]]' [[Imperium Secundus]], as the [[Horus Heresy]] raged. The Gilded Sentinels would later be tasked with aiding the [[Space Marine Legion|Legion]]'s efforts to replenish the losses they suffered in the [[Betrayal at Calth]]. This led several of the Sentinels' artillery Regiments to be dispatched to recover the Ultramarines' [[Gene-seed]] that was stored on [[Talassar]], with the [[Luminous Host]] [[Solar Auxilia]] and [[Judiciar]] [[Aster Crohne]]'s [[Blood Angels]] forces. However by then, the world was in rebellion, after the [[Night Lords]] had invaded Talassar and turned some of its population against the Imperium.{{Fn|1a}} Despite the [[Traitor Legion]]'s efforts though, the Blood Angels succeeded in reclaiming the Gene-seed from '''Velx City''''s '''Castrum Velx''' fortress.{{Fn|1b}}

*1: [https://archive.ph/BmjlW Warhammer Community: Exemplary Battles of the Horus Heresy - The Sanguinary Guard Swoop Into Battle] ''(Saved archive page, dated June 11 2024, last accessed 17 October 2024, original link: https://www.warhammer-community.com/en-gb/articles/CKjl9AGP/exemplary-battles-of-the-horus-heresy-the-sanguinary-guard-swoop-into-battle/)'' - [https://www.warhammer-community.com/wp-content/uploads/2024/06/zxc5pjdMmgEBrmJT.pdf Assault On Castrum Velx PDF] ''(Last accessed on 17 October 2024)''