The , also known as the Guandong Army (관동군), was an army group of the Imperial Japanese Army in the early twentieth century. It became the largest and most prestigious command in the IJA. Many of its personnel, such as Chief of Staff Hideki Tojo, were promoted to high positions in both the military and civil government in the Empire of Japan and it was largely responsible for the creation of the Japanese-dominated Empire of Manchukuo. "Kwantung" means "east of Shanhaiguan," a guarded pass, east of which lies Manchuria.
Following the Russo-Japanese War, Japan obtained the Kwantung Leased Territory and the areas adjacent to the South Manchurian Railway. The Kwantung Garrison was established in 1906 to defend this territory, and originally was composed of an infantry division and a heavy siege artillery battalion, supplemented with six independent garrison battalions as railway guards deployed along the South Manchurian Railway Zone, giving a total troop strength of 10,000 men. It was headquartered in Ryojun. After a reorganization in 1919, the Kwantung Garrison was renamed the Kwantung Army.
In the highly politicized Imperial Japanese Army of the 1920s and 1930s, the Kwangtung Army was a stronghold of the radical Kodoha, and many of its senior leaders overtly advocated political change in Japan through the violent overthrow of the civilian government to bring about a Showa Restoration, with a reorganization of society and the economy along totaliarian state socialist lines. They also advocated a more aggressive, expansionistic foreign policy with regards to the Asian mainland. Members, or former members, of the Kwantung Army were active in numerous coup d'etat attempts against the civilian government, cumulating with the February 26 Incident of 1936.
Presented with the fait accompli, Imperial General Headquarters had little choice but to follow up on the actions of the Kwantung Army with reinforcements in the subsequent Pacification of Manchukuo. The success of the campaign meant that the insubordination of the Kwantung Army was rewarded rather than punished.
With the foundation of Manchukuo in 1932, Kwantung Army played a controlling role in the political administration of the new state as well as in its defense. The commander in chief of the Kwantung Army simultaneously held the post of Japanese ambassador to Manchukuo. With the Kwantung Army administering all aspects of the politics and economic development of the new state, this made the Kwantung Army commander equivalent to a resident general, with the authority to approve or countermand any command from the nominal emperor of Manchukuo, Puyi.
The Kwantung Army was heavily augmented over the next few years up to a strength of 700,000 troops by 1941 and its headquarters was transferred to the new Manchukuo capital of Hsinking. The Kwantung Army also oversaw the creation, training and equipping of an auxiliary force, the Manchukuo Imperial Army. During this time, Prince Tsuneyoshi Takeda worked as liaison officer between the Imperial house and the Kwantung Army.
However, the much vaunted reputation of the Kwantung Army was severely challenged in battle against the Soviet Union's Red Army at the Battle of Lake Khasan in 1938 and subsequent Battle of Nomonhan in 1939, during which time it sustained heavy casualties. After the Nomonhan incident, the Kwantung Army was purged of its more insubordinate elements, as well as proponents of the Hokushin-ron doctrine who urged that Japan concentrate its expansionist efforts on Siberia rather southward towards China and Southeast Asia.
Although a source of constant unrest during the 1930s, the Kwantung Army remained remarkably obedient during the 1940s. As combat spread south into central China and southern China in the Second Sino-Japanese War, and with the outbreak of the Pacific War, Manchukuo was largely a backwater to the conflict.
However, as the war situation began to deteriorate for the Imperial Japanese Army on all fronts, the huge, well-trained and well-equipped Kwangtung Army could no longer be held in strategic reserve. Many of its front line units were systematically stripped of their best units and equipment, which were sent south against the forces of the United States in the Pacific Islands or the Philippines. Other units were sent south into China for Operation Ichi-Go.
At the time of the Manchurian Strategic Offensive Operation, when the Soviet Red Army invaded Manchukuo, Inner Mongolia, Korea and Japanese held islands in August 1945, the Kwantung Army's strength was still at around 600,000 men, with one armored division, 25 infantry divisions, six independent brigades, and up to 25 security battalions. However, the men remaining were largely semi-trained conscripts or raw recruits, equipped primarily as a counterinsurgency and border security force and unable to withstand the massive Soviet armored and mechanized infantry invasion.
The final commander in chief of the Kwantung Army, General Otozo Yamada, ordered a surrender on August 16 1945, one day after Emperor Hirohito announced the defeat of the Japanese empire in a radio announcement. Some Japanese divisions refused to surrender, and combat continued for the next few days. Marshal Hata received "Ultimatum to surrender" from Soviet General Georgii Shelakhov in Harbin on August 18, 1945. He was one of the senior generals who agreed with the decision to surrender, and on August 19th, 1945, Hata had talks with Marshal Aleksandr Vasilevsky, but asked that he be stripped of his title of Field Marshal in atonement for the Army’s failures in the war.
The remnants of the Kwantgung Army either lay dead on the battlefield or were on their way to Soviet Prisoner-of-war camps. Over five hundred thousand of Japanese prisoners of war were forced to work as slave labor in Soviet labor camps in Siberia, Russian Far East and Mongolia. The survivors were not freed until after the normalization of diplomatic relations between Japan and the Soviet Union in the mid-1950s.
After the surrender of Japan, the Soviet Red Army discovered secret installations for experimenting with and producing chemical weapons and biological weapons of mass destruction centered around secret Army Unit 731 and its subsidiaries. At these locations, the Kwantung Army was also responsible for some of the most infamous Japanese war crimes, including the operation of several human experimentation programs using live Chinese, Korean, Mongolian, American and Russian civilians and POW, directed by Shiro Ishii.
Some members of the World War II leadership of the Kwantung Army were sentenced as war criminals by the Khabarovsk War Crime Trials, where other were taken into custody by the United States, and sentenced at the 1948 International Military Tribunal for the Far East in Tokyo. Among those sentenced to death were former generals Seishiro Itagaki, Iwane Matsui, Kenji Doihara, Hideki Tojo and Akira Muto.
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