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The '''Haradni 13th''', also known as the '''Haradni 13th Heavy Armour Regiment''' was a [[regiment]] of the [[Imperial Guard]] which at an unknown point defected to [[Chaos]] and joined the forces of [[Abaddon the Despoiler]]. During the [[13th Black Crusade]], the Haradni 13th would be charged with [[13th Black Crusade_#Battle of Medusa|capturing]] [[Medusa (Planet)|Medusa]], [[Adeptus Astartes Homeworld|homeworld]] of the [[Iron Hands]] [[Space Marines]]. At their peak the Regiment is said to have fielded over 10,000 tanks, including not only [[Leman Russ Battle Tank]]s but also heavier [[Super heavy tank]]s such as [[Baneblade]]s. In the end however they were defeated in the largest armoured battle of the [[Imperium]] since the [[Horus Heresy]] and wiped out by the Iron Hands and their [[PDF]] forces.{{Fn|1]}}