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Beta-Garmon served as the mustering point for the Imperial retribution force before it struck Prospero. Later in the Horus Heresy, it was taken by the Emperor's Children only to be retaken by Salamanders, Imperial Army and loyalist Titan Legions in the Battle of Nyrcon. Heavily fortified by Rogal Dorn thereafter, Beta-Garmon became the site of vicious fighting between Imperial and traitor forces due to its strategic importance. The battle was one of the largest of the Heresy, but ultimately it was the forces of the Warmaster that emerged victorious.