The Battle of Mindanao was fought by United States forces and allied Filipino guerrillas against the Japanese from 10 March - 15 August 1945 at Mindanao island in the Philippine Archipelago, in a series of actions officially designated as Operation VICTOR V, and part of the campaign for the liberation of the Philippines during World War II. The battle was waged to complete the recapture of the southernmost portions of the archipelago and secure them from remaining Japanese forces.