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Soviet-Japanese Border War 1939

[also called the Battle of Khalkin Gol]

State Entry Exit Combat Forces Population Losses
Japan 1938 1939 1000000 77000000 15000
Russia 1938 1939 5000000 170000000 4000

The increased military activities in China--and the Japanese idea of establishing "Mengukuo" in Inner Mongolia and the Mongolian People's Republic--soon led to a major clash over rival Mongolia-Manchukuo border claims. When Japanese troops invaded eastern Mongolia, a ground and air battle with a joint Soviet- Mongolian army took place between May and September 1939 at the Battle of Halhin Gol. The Japanese were severely defeated, sustaining as many as 80,000 casualties, and thereafter Japan concentrated its war efforts on its southward drive in China and Southeast Asia, a strategy that helped propel Japan ever closer to war with the United States and Britain and their allies.

in 1938 and 1939 Soviet and Japanese armies tested each other in two full-scale battles along the border of Manchukuo. But in April 1941 a neutrality pact was signed with the Soviet Union, with Germany acting as intermediary.

The Japanese Kwangtung Army, then occupying Manchuria, attacked Soviet and Mongolian forces holding disputed territory along the Khalkin River (May 1939). The Japanese attacked in divisional strength (15,000 to 20,000); three Soviet and Mongolian divisions, including several armored brigades, in all numbering 60,000 to 70,000 and commanded by General Georgi Zhukov, successfully counterattacked, reoccupying and holding the disputed territory. Their elite forces badly beaten, the Japanese withdrew, ending the undeclared war (September 1939).

After their border war defeat by Soviet and Mongolian forces and their lack of progress in China, the Japanese turned decisively toward the invasion of Indochina and the coming war in the Pacific.

Last Update: December 16, 2000

Armed Conflict Events Database

Armed Conflict Events Data (ACED) is an research project providing independent information about known wars, international disputes, civil wars, rebellions, coups, revolutions, genocides and other violent conflicts. ACED has been online since December 2000. Various partial revisions and modifications have been implemented since then, however, the limitations of the this format hamper further development. During 2005, the decision was made to radically restructure the available conflict information into a database. The new Armed Conflict Events Database (ACEDb) will substantially increase the utility of available conflict data for students of military history. As well, it will offer expanded opportunities to add and edit records of conflict. Existing research material will be maintained in its present form but no revisions are planned. More news about the development of ACEDb may be found at News About the Armed Conflict Events Database. Feedback is welcome.