The Battle of Wuyuan (March 16 – April 3, 1940; Chinese: 五原戰役) was a Chinese counterattack defeating a Japanese offensive in the Wuyuan area as part of the 1939-40 Winter Offensive in Suiyuan during the Second Sino-Japanese War. The Japanese call it the "Second Battle of the Back Loop" (第2次後套作戦).
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