Battle of Guanjianao

Battle of Guanjianao
	Part of Hundred Regiments Offensive in the Second Sino-Japanese War
	; In October 1940, Peng Dehuai commanded the operation on the front line of Guanjianao (photographed by Xu Xiaobing)
Date	October 30–31, 1940; (1 day)
Location	Guanjianao, Wuxiang County, Shanxi, China
Result	Japanese victory
Belligerents
Republic of China	Empire of Japan
Commanders and leaders
Peng Dehuai	Kenshu Okazaki
Units involved
8th Route Army	Okazaki Detachment
Strength
20,000 men	500–535 men
Casualties and losses
500+ killed; 1,570 wounded	Japanese records:; 50 killed; 99 wounded; Chinese claims:; 400+ Japanese killed

The Battle of Guanjianao was the costliest offensive battle suffered by the Eighth Route Army during the Second Sino-Japanese War, and formed part of the third phase of the Hundred Regiments Offensive.

In the later stage of the Eighth Route Army's sabotage operations in North China, the Imperial Japanese Army counterattacked and advanced to areas close to the Eighth Route Army headquarters.

From 30 October to 31 October 1940, the Eighth Route Army assembled nearly 20,000 troops to besiege approximately 500 Japanese soldiers occupying Guanjianao. However, after two days and nights of fighting, the Japanese force was not completely annihilated. On 1 November, Japanese reinforcements arrived, forcing the Eighth Route Army to withdraw.

The Battle of Guanjianao is regarded as one of the most controversial engagements of the Hundred Regiments Offensive, and was considered by Peng Dehuai to be one of the four major defeats of his military career.