The Imperial Fifth Fleet was an element of the Imperial Navy assigned to the defense of the Tarkin Corridor and nearby outlying systems. Towards the start of the Galactic Civil War, the Fifth Fleet was charged with spearheading the exploration and establishment of the Deep Core. The fleet was commanded by Fleet Admiral Jard Kisal. Kisal would prove his disloyalty in the weeks following the Emperor's death at the Battle of Endor. Refusing orders from Sate Pestage to aid in the defense of Imperial Center, Kisal jumped his fleet into the Inner Rim territories where he would wage a war for domination against the Imperial remnants, the New Republic, and rival warlords.