Kaitos Schism

The Kaitos Schism was an Imperial castigation campaign carried out by the Ebon Knights Space Marine Chapter against the world of Kaitos, which had fallen into bloody internecine conflict. During the height of this conflict, large portions of the population rose in outright rebellion, and were forced to be purged with extreme prejudice.

History
At the height of this terrible civil war, when the world of Kaitos rose up in rebellion against the Imperium, Loyalist forces were surrounded by the foe when the entire Ebon Knights Chapter deployed in support. The Ebon Knights launched an immediate attack upon the enemy and, within five hours, the Ebon Knights had wiped out the schismatists' entire high command structure, breaking the back of the rebellion, and essentially winning the war. Their task complete, the Chapter withdrew without a word, as quickly as they had appeared.