sentences:  Allied intelligence greatly under-estimated the number of troops holding the island.The island was held by 11,400 Japanese troops under the command of Colonel Kuzume Naoyuki.Initially, the majority of the combat troops (about 4,000 personnel), were drawn from the veteran 222nd Infantry Regiment which had previously served in China, along with tanks from the IJA 36th Division, supported by artillery, anti-aircraft, construction and naval guard and base troops under Rear Admiral Sadatoshi Senda.