Battle of West Suiyuan
1940 CE.
Shown on the map at 40.811°, 111.652°.
The Battle of West Suiyuan (simplified Chinese: 绥西战役; traditional Chinese: 綏西戰役; pinyin: Suíxī zhànyì) was part of the Second Sino-Japanese War. It was fought from January – February 1940 during the Chinese 1939 Winter Offensive. The Japanese fielded tanks, armoured cars, tear gas and fighter bombers while the Chinese warlord armies involved had no airforce or even equivalent armour.
Text from the Wikipedia article Battle of West Suiyuan, licensed CC BY-SA 4.0.