Sino-Soviet conflict (1929) | |||||||
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Part of interwar period | |||||||
![]() Soviet soldiers with captured Kuomintang banners. | |||||||
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Belligerents | |||||||
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Commanders and leaders | |||||||
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Units involved | |||||||
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Special Red Banner Far Eastern Army
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Strength | |||||||
c. 200,000[9]
| c. 113,000 (peak)[6] | ||||||
Casualties and losses | |||||||
Official Chinese accounts: 2,000 killed, 1,000 wounded, 8,550 captured[11] Modern estimate: c. 5,000 lost[1] |
Official Soviet accounts: 812 killed,[12] 665 wounded, 4 missing[11][13] Modern estimate: Far more than officially reported[12] |
The Sino-Soviet conflict of 1929 (Chinese: 中東路事件, Russian: Конфликт на Китайско-Восточной железной дороге) was an armed conflict between the Soviet Union and the Chinese warlord Zhang Xueliang of the Republic of China over the Chinese Eastern Railway (also known as the CER).
The conflict was the first major combat test of the reformed Soviet Red Army, which was organized along the latest professional lines, and ended with the mobilization and deployment of 156,000 troops to the Manchurian border. Combining the active-duty strength of the Red Army and border guards with the call-up of the Far East reserves, approximately one in five Soviet soldiers was sent to the frontier, the largest Red Army combat force to be fielded between the Russian Civil War (1917–1922) and the Soviet Union's entry to the Second World War.[14]
In 1929, the Chinese Northeastern Army took over the Chinese Eastern Railway to regain sole control of it. The Soviet Union quickly responded with a military intervention and eventually forced the Chinese to return the railway to the previous format of joint administration.[15] During the conflict, the Soviets gained full control of Bolshoy Ussuriysky Island (Chinese: 黑瞎子岛) from China, and its military occupation of the island continued until the 1991 Sino-Soviet Border Agreement, in which Russia agreed to return the western half of the island to China in 2004.[2]