The Eighth Army invaded Palawan Island, between Borneo and Mindoro (the fifth-largest and westernmost Philippine island) on 28 February 1945, with landings at Puerto Princesa. The Japanese put up little direct defense of Palawan, but cleaning up pockets of Japanese resistance lasted until late April, as the Japanese used their common tactic of withdrawing into the mountain jungles, dispersed as small units. Throughout the Philippines, Filipino guerrillas aided US forces to find and dispatch the holdouts.