The Division's 123rd Regiment landed in Sumba of the Lesser Sunda Islands in late November 1943. Soon the "46th division" was reassigned to 19th army. In February 1944, the 147th Regiment landed in nearby Sumbawa island. The divisional headquarters were established on the Sumbawa island. The remaining 145th Regiment was unable to be transported and instead was diverted from Saipan in June 1944 to Iwo Jima under the Lieutenant General Tadamichi Kuribayashi's Ogasawara Corps where it was wiped out in the Battle of Iwo Jima in February - March 1945.