replaced with Colonel Tadashi Takaishi Communications Anti-Aircraft, Major Shotaro Azuma Headquarters Guard Storm Company Rocket Gun, Group B Water Works Ammunition Depot Independent Trench Mortar 1st Company Field Hospital (109th division) 145th Regiment Commanding officer; Colonel Masuo Ikeda, approx. 2,700 men First Battalion; Major mitsuaki Hara Second Battalion; Major Yasutake Third Battalion; Major Kenro Anso Artillery Battalion; Captain Matsuda Engineer Battalion; Captain Kikuzo Musashino Field Hospital 145th Infantry Regiment, Captain Masuda Second Middle Mortar Battalion; Major Jusuke Nadao Third Middle Mortar Battalion; Major Koichiro Kobayashi Third Battalion Third Battalion, 17th Independent Mixed Regiment; Major Tomachi Fujiwara 26th Tank Regiment Commanding officer; Lieutenant Colonel (Baron) Takeichi Nishi, 600 men and what started as 19 tanks. Many of the tanks were disassembled and the turrets concealed so they could be used with less threat of being destroyed by bombardment. 2nd Mixed Brigade Commanding officer; General Osuga was replaced with Major General Sadasue Senda, approx. 5200 men 309th Independent Infantry Battalion; Captain Awatsu 310th Independent Infantry Battalion; Major Iwatani 311th Independent Infantry Battalion; Major Tatsumi 312th Independent Infantry Battalion; Captain Osada 314th Independent Infantry Battalion; Captain Hakuda Artillery Battalion, Major Kazuo Maeda Engineer Battalion, Major Maekawa Field Hospital, Major Masaru Inaok Brigade Artillery Group, Colonel Chosaku Kaido Second Mixed Brigade artillery unit; Major Kazuo Maeda 20th Independent Artillery Mortar Battalion; Captain Mitsuo Mizutari 8th Independent Anti-Tank Battalion; Captain Hajime Shimizu 9th Independent Anti-Tank Battalion; Major Okubo 10th Independent Anti-Tank Battalion; Major Matsushita 11th Independent Anti-Tank Battalion; Captain Node 12th Independent Anti-Tank Battalion; Captain Masao Hayauchi 1st Independent Machine Gun Battalion; Captain Ko Kawanami 2nd Independent Machine Gun Battalion; Major Tokio Kawasaki Navy Imperial Japanese Navy (IJN); Rear Admiral Rinosuke Ichimaru, arrived with 2,216 naval personnel Naval Guard Force, Captain Samaji Inoue 20th Special Machine Cannon Unit; 2nd Lieutenant Momozaki, attached to IJN Guard Force 21st Special Machine Cannon Unit; 2nd Lieutenant Isamu Kondo, attached to IJN Guard Force 43rd Special Machine Cannon Unit; 1st Lieutenant Tamara, attached to IJN Guard Force 44th Special Machine Cannon Unit; unknown, attached to IJN Guard Force Operations, Commander Takeji Mase Communications, Lieutenant Commander Shigeru Arioka Engineering, Lieutenant Commander Narimasa Okada Supply, Lieutenant Commander Okazaki Suribachi Commander, Captain Kanehiko Atsuchi 125th Anti-Aircraft Defense Unit, Lieutenant (j.g.) Tamura 132nd Anti-Aircraft Defense Unit, Ensign Okumura 141st Anti-Aircraft Defense Unit, Lieutenant (j.g.) Doi 204th Naval Construction Battalion, Lieutenant Fujiro Iida, 1,233 men Other units Rocket Gun Company; Captain Yoshio Yokoyama Fifth