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The '''{{PAGENAME}}''' was a battle of the [[Horus Heresy]] in which three independent loyalist forces attacked the [[Xana System]] as it concluded negotiations for alliance with the traitors.

Fought in 009.[[M31]], it began when [[Terra]] received word that the renegade [[Forge World]] of [[Xana]] on the western fringes of the [[Imperium]] had reached an accord with [[Horus]] to supply his armies. The bargain was to have been sealed with the delivery of three new [[Ordinatus Ulator]] weapons.{{Fn|1a}} The ''[[Amphion (Warship)|Amphion]]'', a [[Gloriana Class Battleship]], led an armada of five capital ships against Xana's formidable orbiting fleet as a distraction, while a [[Callidus Assassin]] under the guise of the [[Davin]]ite priest [[Unvacar Noon]] sought to assassinate [[Raxhal Koraddon]], the [[Sons of Horus]] commander sent to collect the weapons, to disrupt the deal and convince Xana to return to the Imperial fold.{{Fn|2}}

The Dark Angels and Shattered Legions fought through waves of Dark Mechanicus [[Battle Automata]] and [[Adsecularis]] before destroying much of the forge complexes of Xana II. Haar's Blackshields withdrew aboard the ''Cicatrice Tyrannis'' after a counter attack of advanced and unfamiliar patterns of [[Battle-Automata]] emerged from the Sheaol penitentiary and destroyed the Ordinatus Ulator ''[[Nepothax]]'' in an attempt to recapture it.{{Fn|1b}}

In the aftermath of the battle, Xana's alliance with Horus was heavily delayed and they undertook raids against both Imperial and traitor assets.{{Fn|1b}} A possible side-effect of the raid was the release of the fallen [[Magos Dominus]] [[Anacharis Scoria]], who would eventually seize Xana and turn it into the first of the Hell-Forges.{{Fn|1c}}

*[[Battles of the Horus Heresy (List)]]

*1: [[The Horus Heresy Book Six - Retribution]]:

**{{Endn|1a}}: pg. 30