Siege of Catovar

The Siege of Catovar was an Imperial defensive campaign fought by the Mourning Wardens Space Marine Chapter in defence of the vitally important Imperial mining world of Catovar from invading Forces of Chaos following the formation of the galaxy-wide tear in reality, known as the Cicatrix Maledictum, following the destruction of Cadia during the 13th Black Crusade.

Background
This campaign lasted merely five months, but it saw the destruction of over half the 1st Company, and only because Drukhari from a mysterious pirate fleet intervened to stave off the swarms of Chaos-devoted pirates which fell on the Mining World of Catovar when the Cicatrix Maledictum opened. De Castelrous, who had come to this world to confront elusive xeno-raiders from Commorragh before joining with the rest of the Chapter on Carnos V - having been kept in reserve by Suarez who didn't want his best men to lose too much manpower in the grounding battles of Carnos - found himself utterly unprepared and unable to muster the will or the tactical acumen to efficiently defend against the cultists. The Drukhari came to help the defeated Defender's troops, allowing him to endure long enough for his already reeling chapter to come and save him. After this humiliating defeat, De Castelrous was demoted to the rank of 9th Defender.