In March 1942, the reorganization was complete and the 4th Division was then reassigned to the 14th Army, arriving in the Philippines to participate in the Battle of Bataan on 3 April 1942. The 4th Division also significantly contributed to Japanese efforts in the Battle of Corregidor on 5 May 1942. After the Philippines campaign (1941–1942) ended on 8 May 1942, the division was returned to the home islands to perform security duties.