Battle of Wuyuan
1940 CE.
Shown on the map at 31.090°, 108.266°.
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).
Text from the Wikipedia article Battle of Wuyuan, licensed CC BY-SA 4.0.