109th Division (Imperial Japanese Army)

109th Division
Active 1944 - 1945
Country Empire of Japan Empire of Japan
Branch Imperial Japanese Army
Type Infantry
Role Garrison
Size 21,000
Engagements

World War II

Commanders
Notable
commanders		 Tadamichi Kuribayashi

The Imperial Japanese Army's (IJA) 109th Infantry Division or 109th Division (第109師団 Dai-hyakuku Shidan) was a division of 21,000 soldiers. Commanded by Tadamichi Kuribayashi, it was the main Japanese garrison on the volcanic islands of Iwo Jima and Chichi Jima which was attacked by American forces from February to March 1945.

Formation

Formed on 30 June 1944, the 109th Division of the 31st Army, under Commanding Lieutenant General Hideyoshi Obata, consisted of two reinforced brigades under the command of Lt. General Tadamichi Kuribayashi who was a descendant of Samurais.[1]

The structure of the 109th was different than most divisions in the IJA. After 1936, the normal make up of a division was the triangular organization, with three infantry regiments to a division. The 109th (along with the 91st Infantry Division) were considered square divisions because they had two infantry brigades (5000 men each) with two infantry regiments each.[2] During the buildup prior to the attack of Iwo-jima General Kuribayashi divided the 109th and each was built up to maximum strengths. The 109th, as the Ogasawara island Detachment was the Ogasawara (Bonin Islands) District Group, also called the Ogasawara Army Group, with an approximate strength of 47,000 troops.

1st Brigade

The 1st Independent Mixed Brigade, led by Major General Tachibana, and the 17th Independent Mixed Regiment, as well as other elements, were stationed on Chichi-Jima (Father Island) with approximately 25,000[3] troops. Many were deployed to other island defenses such as the rest of the middle cluster known as Father Island (groups); Ani-jima, Ototo-jima, Mago-jima, along with islets Higashi-jima, Nishi-jima, and Minami-jima. The northern-most cluster or Groom Islands (group) included; Yome-jima, Muko-jima, and Nakōdo-jima or Nakadachi-jima. The southern-most cluster known as the Mother Island (group) of Haha-jima, Ane-jima, Imōto-jima, Mei-jima, along with the smaller Hira-shima and Muko-jima. These group's of islands were by-passed when Iwo-jima was chosen to attack but were subjected to bombing and naval shelling by the U.S. military.

2nd Brigade

The 2nd Independent Mixed Brigade, led by Major General Kotau Osuga, and the Third Battalion of the 17th Regiment, led by Major Tomachi Fujiwara, was on Iwo Jima with Kuribayashi.[4] The 2700 man 145th infantry regiment under Colonel Masuo Ikeda, a part of 46th division, was diverted from Saipan to Iwo Jima and Rear Admiral Toshinosuke Ichimaru that arrived with 2300 navy personnel.[5]

Many of the 109th's personnel had previously served in China, Burma and the Dutch East Indies and had become reservists who were now reluctant to go back to battle.[4] To bolster morale the Japanese Emperor Hirohito sent his own palace guard of anti-aircraft gunners to Chichi Jima to support the troops[4]—as it was expected the main force of Americans would strike there, however the Allied Joint Chiefs of Staff decided to bypass Chichi Jima altogether.

Preparations

A U.S. map of tunnel defences around Iwo Jima built by the 109th

With preparations underway Kuribayashi worked with the tactic of defense-in-depth building numerous pillboxes for machine-gunners and 13,000 yards of tunnels with even a field-hospital worked in. However he had issues with many officers—dismissing 18 of them along with his Chief-of-staff, Kuribayashi also lost control of the Naval troops who dug in on the beaches.[1]

The Battle Begins

American troops capture a Japanese flag
Main article: Battle of Iwo Jima

On the 19th of February 1945 the battle began, but quickly came the feeling that the 109th were doomed as air or naval relief would not be able to help. Kuribayashi ordered his troops to inflict maximum damage and casualties on the enemy and to "kill 10 men before dying".[1]

For 33 days the 109th fought on Iwo Jima, facing against tanks and heavy bombardments from the sea and air. In the end only 1083 Japanese survived, with a mere 216 captured from the 109th's 21,000 men during the battle, the other 867 Japanese soldiers came from other units. As for Kuribayashi, it is generally thought that he committed suicide by leading the last major counterattack. The rest held out hungry and alone in Iwo Jima's tunnels until the U.S. soldiers used explosives to clear the tunnels weeks later.[1]

Elements of the 109th

The 109th Division comprised the 1st and 2nd Mixed Brigade. The 3rd Battalion of the 17th Independent Mixed Regiment was on Iwo Jima and there were many attached units[6][7]

Headquarters Group

The 109th Chief of staff (detached to Chichi jima); Colonel Hori, was replaced with Colonel Tadashi Takaishi

145th Regiment

Commanding officer; Colonel Masuo Ikeda, approx. 2,700 men

145th Infantry Regiment, Captain Masuda

Third Battalion

Third Battalion, 17th Independent Mixed Regiment; Major Tomachi Fujiwara

26th tank Regiment

Nishi with Olympic steed, Uranus

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

Brigade Artillery Group, Colonel Chosaku Kaido

Navy

The volcanic island of Iwo Jima being bombarded before its invasion

Naval Guard Force, Captain Samaji Inoue

Other units

The exact strength of Navy personal is subject to question. With an estimate of approximately 21,000 troops it was reported that the IJA had 17,500 troops and the IJN had 5,500 troops and another report 13,586 IJA and 7,347 IJN troops.[8]

Knowledgeable Predictions

During a dinner with Major Yoshitaka Horie (in charge of 109th Divisions Detached Headquarters on Chichi Jima) Kuribayashi asked Horie his opinion for defending Iwo Jima, to which Horie replied it was vulnerable as "a pile of eggs" and better to sink it to the bottom of the ocean with enough explosives.[4] Kuribayashi—who had spent much time in Canada as deputy military attache and traveled often in America—was in agreement, however they knew that at 628 miles from Tokyo Iwo Jima would be "a dagger aimed straight at the heart of the homeland". Before leaving Japan to take up his post, Kuribayashi had informed his wife not to expect him home.

See also

References

  1. 1 2 3 4 "wwii1161". www.worldwar2database.com. Retrieved 24 March 2013.
  2. ↑ IJA organization- Retrieved 2014-04-17
  3. ↑ Bradley, James (2003). Flyboys: A True Story of Courage (hardcover) (1st ed.). Little, Brown and Company (Time Warner Book Group). ISBN 0-316-10584-8. Retrieved 2010-01-15. Note: Google review- Retrieved 2015-04-17
  4. 1 2 3 4 Hearn, Chester G. (2003). Sorties Into Hell: The Hidden War on Chichi Jima. Greenwood Publishing Group. ISBN 0-275-98081-2.
  5. ↑ Iwo Jima: 109th Division-Retrieved 2014-04-15
  6. ↑ axishistory.com: 109th Division elements- Retrieved 2014-04-17
  7. ↑ hyperwar: 109th Division elements- Retrieved 2014-04-17
  8. ↑ U.S. Marine Corps World War II Order of Battle:Ground and Air Units in the Pacific War, 1939-1945 (Google eBook)- Retrieved 2014-04-17
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