The Battle of Tyrok Fields marked the beginning of Abaddon the Despoiler's 13th Black Crusade, at the Tyrok Fields on the Imperial Fortress-World of Cadia in 999.M41. The battle was an attempt by Abaddon to begin his conquest of the Cadian Gate by killing the entire high command of Cadia in one fell swoop through treachery. His plan was foiled by Colonel Ursarkar E. Creed and the 8th Cadian Regiment of the Imperial Guard. Following the battle, Colonel Creed was raised as the new Lord Castellan of Cadia and proved to be an exceptional Imperial strategist in the terrible battles of the 13th Black Crusade that followed.