The Kwantung Army (Japanese: 関東軍, Kantō-gun) was a general army of the Imperial Japanese Army from 1919 to 1945.
The Kwantung Army formed in 1906 as a security force for the Kwantung Leased Territory and South Manchurian Railway Zone after the Russo-Japanese War of 1904–1905, and expanded into an army group during the Interwar period to support Japanese interests in China, Manchuria, and Mongolia. The Kwantung Army became the most prestigious command in the Imperial Japanese Army, and many of its personnel won promotion to high positions in the Japanese military and civil government, including Hideki Tōjō and Seishirō Itagaki. The Kwantung Army was largely responsible for the establishment of the Japanese puppet-state of Manchukuo in Manchuria and functioned as one of the main Japanese fighting forces during the 1937–1945 Second Sino-Japanese War from 1937.
In August 1945 Soviet troops engaged the Kwantung Army during the Manchurian Strategic Offensive Operation. The Kwantung Army surrendered to the Soviets on 16 August 1945 – the day after the Surrender of Japan – and was subsequently dissolved.
The Kwantung Army perpetrated several war crimes during World War II, sponsoring Unit 731, which both carried out acts of biological warfare and performed unethical human experimentation on civilians and Allied prisoners of war.
In 1895, Qing China had granted the Kwantung Leased Territory, a valuable concession territory on the Liaodong Peninsula, to the Empire of Japan in the Treaty of Shimonoseki after their victory in the First Sino-Japanese War. The term "Kwantung" () means "east of Shanhaiguan", a guarded pass west of Manchuria, which was rendered in Japanese as "Kantō". The Russian Empire had particular interest in Kwantung, being one of the few areas in the region with potential to develop ice-free ports for its own expansion in the Far East, and Qing authorities withdrew the lease from the Japanese following the Triple Intervention, only weeks after it had been granted.
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was an Imperial Japanese Army facility called the Kwantung Army Warhorse Disease Prevention Shop that focused on the development of biological weapons during World War II. It was operated by the Kempeitai, the Japanese military police. Its headquarters was located in Mokotan, Manchukuo, a village just south of the city of Changchun. It had branches in Dairen and Hailar. The Hailar branch was later transferred to Foshan. Between 600 and 800 people worked at Unit 100. Unit 100 had six sections.
The Battle of Lake Khasan (29 July – 11 August 1938), also known as the Changkufeng Incident (Хасанские бои, Chinese and Japanese: ; Chinese pinyin: ; Japanese romaji: ) in China and Japan, was an attempted military incursion by Manchukuo, a Japanese puppet state, into the territory claimed and controlled by the Soviet Union. That incursion was founded in the Japanese belief that the Soviet Union had misinterpreted the demarcation of the boundary based on the Treaty of Peking between Imperial Russia and Qing China and the subsequent supplementary agreements on demarcation and tampered with the demarcation markers.
Mengjiang, also known as Mengkiang or the Mongol Border Land, officially referred to as the Mengjiang United Autonomous Government, was an autonomous area in Inner Mongolia, formed in 1939 as a puppet state of the Empire of Japan, then from 1940 being under the nominal sovereignty of the Reorganized National Government of the Republic of China (which was itself also a puppet state). It consisted of the previously Chinese provinces of Chahar and Suiyuan, corresponding to the central part of modern Inner Mongolia.