Sisters of Battle clash with Grey Knights

The first skirmish of the Inquisition war broke out on Ares between the Grey Knights and Adeptus Sororitas. It was triggered when the Sisters of Battle recieved news from their convent on Libria, following the system's excommunication by Inquisitor Xanthus. Reacting to this the Sororitas moved to arrest the senior officer cadre on Ares not part of Astartes chapters. However the Grey Knights refused to let them, and a bloody confrontation left both sides battered and bruised. Realising those loyal to Hathek's heresy were in the ascendency on Ares, the Sisters abandonned the world and retreated to join Xanthus on Xanthus.