Trail of Sorrows

The Trail of Sorrow was a decade-long purgation campaign carried out across three sectors of space by the Ebon Knights Space Marine Chapter. But behind the facade of carrying out the orders of the High Lords of Terra, in reality, their true intentions were to run to ground over a dozen Fallen that had concealed themselves amongst the ranks of the Eternal Revenants Chaos Warband. Eventually, their location is identified, and the Ebon Knights, alongside another fellow Unforgiven Chapter, capture their elusive quarry.

History
The Ebon Knights begin a three decades-long campaign that uproots hidden cults and corrupt officials across three sectors of Imperial space. In truth, the Chapter learned of twenty Fallen that were concealing themselves within the ranks of Osiris the Man Eater's Eternal Revenants (a Night Lords' warband) operating within these sectors. Beset with many battles to hunt down these traitors and despite several ambushes set by the Night Lords, the Ebon Knights eventually prevail as the Manticores located the Fallen on the plague-ridden world of Lithios Prime, capturing all of them at the Battle of Crimson Ridge.