War of Moridan IV

The War of Moridan IV was a castigation campaign carried out by the Ebon Knights Space Marine Chapter against a heretical cult on the hive world of Moridan IV. After making planetfall, upon further investigation the Ebon Knights discovered this cult was, in fact, a gene-stealer cult and that a Tyranid Broodlord had infected a large portion of the planet's population. The Ebon Knights deployed two squads of their elite 1st Company. The brutal campaign in the dark reaches of the underhive was a long and brutal affair, but in the end, the Ebon Knights emerged victorious and the xenos menace was eradicated.

History
At the dictate of Inquisitor Mazrael, the Ebon Knights exterminate a heretical cult on the Hive-World of Moridan IV. It is eventually discovered that a Tyranid Broodlord had infected the populace. Two squads of the First Company's Terminators are deployed into the underhive. The Chapter fights terrifying battles in cramped tunnels, access ways, vents and ducts but emerges victorious