Soon after the Japanese invasion of the Philippines in 1941, MacArthur, in accordance with the pre-war plan, declared Manila an open city, and ordered his forces on Luzon to withdraw to Bataan. The Philippine government, the High Commissioner's office and MacArthur's USAFFE headquarters moved to Corregidor Island. Although the dependents of U.S. military personnel had been sent back to the United States, MacArthur was, until his recall from retirement, a Philippine government employee, so his family had remained in the Philippines. MacArthur's wife, Jean MacArthur, and young son, Arthur MacArthur IV, went with him to Corregidor. Arthur celebrated his fourth birthday on Corregidor, on 21 February 1942. When an aide asked about Arthur's possible fate, MacArthur replied: "He is a soldier's son."