The Battle for the Philippines primarily unfolded in two significant phases: the initial Japanese invasion from December 1941 to May 1942 and the subsequent liberation campaign from 1944 to 1945. The Philippines, a strategic outpost in the Pacific, was attacked by Japanese forces shortly after the attack on Pearl Harbor, leading to a swift occupation of the islands. American and Filipino troops faced overwhelming odds, resulting in the fall of key positions such as Bataan and Corregidor by May 1942, where many soldiers suffered from starvation and disease before surrendering.