Battle of Wuyuan

Battle of Wuyuan
	Part of Second Sino-Japanese War
	; Chinese 35th Army
Date	March 16 – April 3, 1940; (2 weeks and 4 days)
Location	Vicinity of Wuyuan in Western Suiyuan
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
According to commander Fu Zuoyi's report on 24th April 1940 : ; 1,211 killed; 1,288 wounded; 233 missing; ; According to history of the Anti-Japanese War : ; 1,943 killed or wounded; 278 missing	Heavy. More than 100 out of the 300 Japanese police officers killed or went missing.;

The Battle of Wuyuan (March 16 – April 3, 1940; Chinese: 五原戰役) was a Chinese counterattack that defeated the Japanese invasion of the Wuyuan area. This happened in reaction to the Chinese 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).

By 28 January 1940 the Japanese had built up forces from the 26th Division at Baotou sufficient to launch the First battle of the Back Loop (第1次後套作戦) to recover lost territory and move west to take Wuyuan which fell on February 3 and Linhe further west on 4 February.