Battle of Wuyuan

Battle of Wuyuan
	Part of the 1939–1940 Winter Offensive in the Second Sino-Japanese War
	; Chinese 35th Army
Date	March 16 – April 3, 1940; (2 weeks and 4 days)
Location	Vicinity of Wuyuan County in the western part of Suiyuan, Republic of China
Result	Chinese victory
Belligerents
Republic of China	Empire of Japan
Commanders and leaders
Fu Zuoyi; Ma Hongbin; Ma Hongkui; Ma Buqing	Naozaburo Okabe; Shigenori Kuroda
Strength
16,587 including Chinese Muslim Cavalry	5,000 – 10,000 Puppet Mongolian Army : approximately 3,000; Puppet West Suiyuan Army : approximately 1,000; West Suiyuan Garrison : more than 1,500 (including approximately 310 Japanese police officers);
Casualties and losses
Contemporary report:; 1,211 killed; 1,288 wounded; 233 missing; ; 1962 book:; 1,943 killed or wounded; 278 missing	Heavy More than 100 of 300 police officers killed or missing;

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).