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Assigned to the [[933rd Expeditionary Fleet]], he was not among those of his brothers who suffered betrayal at the [[Battle of Calth]]. After learning of the treachery, Roscius gathered forces and launched a guerrilla war against traitor forces in the [[Shadow Crusade]]. He captured the [[Sons of Horus]] [[Strike Cruiser]] ''[[Plutol]]'' a [[Segmentum]] away from [[Ultramar]], and 6 weeks later used it to cripple a [[Death Guard]] [[Heavy Transport]] at [[Terrax]]. He also struck at a [[Dark Mechanicum]] refueling station at [[Yspouta]]. Eventually, Roscius and his forces of resistance grew to 3,000 [[Astartes]] drawn from four different [[Space Marine Legion|Legions]]. The last known engagement he was engaged in was the Duthovan Blockade, where he sought to isolate traitor forces stranded on [[Duthovan]] by the [[Ruinstorm]]. Few on either side survived the battle.{{Fn|1}}