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The '''{{PAGENAME}}''' was a battle of the [[Horus Heresy]].{{Fn|2}} Fought in 006.[[M31]], it is the earliest known engagement of the [[Dark Angels]] in the conflict.{{Fn|1a}} It was also known as the '''Battle of the Rangda System''', as some chroniclers of the Horus Heresy knowingly or inadvertently misidentified [[Advex-Mors]] as the old homeworld of the [[Rangda]] [[Xenos]].{{Fn|1a}}{{Fn|2}}

The [[Rangdan Xenocides]] were among the most catastrophic wars of the [[Great Crusade]], and brought the [[Imperium]] to the brink of destruction. In fact, the conflicts were so terrible that much information about them was suppressed or destroyed after the Imperials finally claimed victory. The nature of this victory itself was highly disputed, and many conflicting accounts existed about the final Rangdan Xenocide.{{Fn|1b}}

The station at Advex-Mors harbored the secret knowledge and waeponry associated with the Rangda and the Xenocides.{{Fn|1b}} The 51st Dark Angels Chapter, known as the Sable Griffons, was tasked to guard and protect the Order of Broken Claws in turn. The Advex-Mors garrison was eternally vigilant for the possible return of the Rangda.{{Fn|1a}}

In 006.[[M31]], the Dark Angels at Advex-Mors were hailed by the [[Sons of Horus]] [[Heavy Cruiser]] ''[[Conqueror's Pride]]'' which signaled it needed to resupply. Once in orbit, several squadrons of [[Stormbird]]s and [[Storm Eagle]]s headed for the surface of Advex-Mors. Queries from the Dark Angels regarding their destination were ignored and when [[Praetor (Rank)|Knight-Praetor]] [[Kordray Mordred]] demanded to speak with the Sons of Horus commander, he was met with a sudden and indiscriminate barrage. The barrage left little of the Dark Angels fortifications intact yet inflicted only light damage on the chantry house of the Order of Broken Claws.{{Fn|1a}}

could spare no time to exact any revenge, for the [[Promethean Class Cruiser]] ''[[Invidious]]'' had returned, called back from patrol by Knight-Praetor Mordred, and the ''Conqueror's Pride'' was no match for the ancient Terran warship in open battle. Bloodied in body and pride, the Sons of Horus fled the Advex-Mors system. They had come seeking both weapons for Horus' desperate rebellion and to break the will of one of the unquestionably loyal Legions but could claim little more than a pyrrhic victory.{{Fn|1a}} However, the potency of the captured waepons could turn the Horus Heresy in the Traitors' favor.{{Fn|2}}

*{{Endn|1}}: [[The Horus Heresy Book Nine - Crusade]]

**{{Endn|1a}}: pg. 125-126