The Rangdan Xenocides were a series of xenocidal campaigns carried out against the xenos threat known as the Rangdan Cerabvores during the 860s of the 30th Millennium during the latter years of the Great Crusade. These wars were the most terrible of any yet fought by the Expeditionary Fleets of the burgeoning Imperium of Man. The threat was only stymied after the intervention of the Emperor Himself and at least three Space Marine Legions, over a dozen Legio Titanicus Titan Legions, several Imperial Knight Houses, the military forces of the Mechanicum and hundreds of thousands of troops of the Imperialis Auxilia.