The was a

field army A field army (also known as numbered army or simply army) is a military formation in many armed forces, composed of two or more corps. It may be subordinate to an army group. Air army, Air armies are the equivalent formations in air forces, and ...

of the

Imperial Japanese Army The Imperial Japanese Army (IJA; , ''Dai-Nippon Teikoku Rikugun'', "Army of the Greater Japanese Empire") was the principal ground force of the Empire of Japan from 1871 to 1945. It played a central role in Japan’s rapid modernization during th ...

during

World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...

History

The Japanese 18th Army was formed on November 9, 1942, under the Japanese Eighth Area Army of the

Southern Expeditionary Army Group The was a general army of the Imperial Japanese Army during World War II. It was responsible for all military operations in South East Asian and South West Pacific campaigns of World War II. Its military symbol was NA. The Southern Expediti ...

for the specific task of opposing landings by Allied forces in Japanese-occupied

New Guinea New Guinea (; Hiri Motu: ''Niu Gini''; , fossilized , also known as Papua or historically ) is the List of islands by area, world's second-largest island, with an area of . Located in Melanesia in the southwestern Pacific Ocean, the island is ...

. Upon establishment, it was made up of three divisions: the 20th, which had been raised from men from

Kyushu is the third-largest island of Japan's Japanese archipelago, four main islands and the most southerly of the four largest islands (i.e. excluding Okinawa Island, Okinawa and the other Ryukyu Islands, Ryukyu (''Nansei'') Ryukyu Islands, Islands ...

, and the 41st and 51st Divisions formed from the

Kantō region The is a geography, geographical region of Honshu, the largest island of Japan. In a common definition, the region includes the Greater Tokyo Area and encompasses seven prefectures of Japan, prefectures: Chiba Prefecture, Chiba, Gunma Prefe ...

New Guinea campaign

Both the 20th and 41st Divisions arrived in New Guinea safely. However, the 51st Division, including the army's commander, Hatazō Adachi, and his senior staff, came under Allied air attack while en route from their supply base at Rabaul to Lae, in the Battle of the Bismarck Sea. All eight transport ships and four destroyers were sunk with the loss of 3,664 men, and only 2,427 men of the division were rescued.

Operation Cartwheel Operation Cartwheel (1943 – 1944) was a major military operation undertaken by the Allies in the Pacific theatre of World War II. The ultimate goal of Cartwheel was to neutralize the major Japanese base at Rabaul. The operation was di ...

, an Allied master plan implemented from mid-1943, progressively severed the supply lines between Rabaul and frontline Japanese forces. Key defeats included the withdrawal of the

Imperial Japanese Navy The Imperial Japanese Navy (IJN; Kyūjitai: Shinjitai: ' 'Navy of the Greater Japanese Empire', or ''Nippon Kaigun'', 'Japanese Navy') was the navy of the Empire of Japan from 1868 to 1945, Potsdam Declaration, when it was dissolved followin ...

from the

Solomon Islands campaign The Solomon Islands campaign was a major military campaign, campaign of the Pacific War during World War II. The campaign began with the Empire of Japan, Japanese seizure of several areas in the British Solomon Islands and Bougainville Island, B ...

, followed by landings on New Britain, as well as Aitape and Hollandia, in April 1944. Adachi's forces were badly affected by tropical diseases including

malaria Malaria is a Mosquito-borne disease, mosquito-borne infectious disease that affects vertebrates and ''Anopheles'' mosquitoes. Human malaria causes Signs and symptoms, symptoms that typically include fever, Fatigue (medical), fatigue, vomitin ...

, heat exhaustion and

malnutrition Malnutrition occurs when an organism gets too few or too many nutrients, resulting in health problems. Specifically, it is a deficiency, excess, or imbalance of energy, protein and other nutrients which adversely affects the body's tissues a ...

for the remainder of the war, despite Adachi's efforts to achieve some form of self-sufficiency by planting crops and giving priority in rations to the sick. As ammunition began to run low, many of Japanese field commanders resorted to

banzai charge Banzai charge or Banzai attack () is the term that was used by the Allied forces of World War II to refer to Japanese human wave attacks and swarming staged by infantry units. This term came from the Japanese battle cry , and was shortened to ...

s, rather than surrender. By the end of the war in September 1945, most of his forces had been annihilated. Of Adachi's original 140,000 men, barely 13,000 were still alive when the war ended.Williams and Nakagawa 2006, p. 59. The remnants of the Japanese 18th Army surrendered to the

Australian 6th Division The 6th Division was an infantry Division (military), division of the Australian Army. It was raised briefly in 1917 during World War I, but was broken up to provide reinforcements before seeing action. It was not re-raised until the outbreak o ...

at Cape Wom, by Wewak, New Guinea.Johnston 2008, p. 234. They were held on Mushu Island before being returned to Japan.

List of Commanders

Notes

References

Books

* * * * *

Journals

* {{cite journal, author=Williams, Peter D. , author2=Nakagawa, Naoko , title=The Japanese 18th Army in New Guinea , journal=Wartime , issue=36 , date=October 2006 , pages=58–63 , publisher=Australian War Memorial , location=Canberra, Australian Capital Territory , issn=1328-2727 18 Military units and formations established in 1942 Military units and formations disestablished in 1945 J