Hundred Regiments Offensive

Hundred Regiments Offensive
	Part of the Second Sino-Japanese War
	; Victorious Chinese Communist soldiers holding the flag of the Republic of China.
Date	20 August 1940 – 24 January 1941; (5 months and 4 days)
Location	Shanxi, Hebei, Henan, Chahar
Result	Chinese victory
Belligerents
Republic of China Chinese Communist Party;	Empire of Japan Wang Jingwei regime;
Commanders and leaders
Peng Dehuai; Zhu De; Zuo Quan; Liu Bocheng; He Long; Nie Rongzhen; Chen Geng; Deng Xiaoping	Hayao Tada
Units involved
8th Route Army	North China Area Army; Collaborationist Chinese Army
Strength
200,000	270,000 Japanese troops; 150,000 Chinese collaborators
Casualties and losses
22,000–100,000 (counting desertions); Chinese figure:; 5,890 killed; 11,700 wounded; 307 missing; 21,182 poisoned (some as many as five to six times)	Several record from different sources:; CCP records:; 1. 12,645 killed and wounded, 281 POW.; 2. 20,645 Japanese and 5,155 Chinese collaborators killed and wounded, 281 Japanese and 18,407 Chinese collaborators captured Japanese military record:; 1. No figure about total casualties, 276 KIAs from 4th Independent Mixed Brigade. 133 KIA and 31 MIA from 2nd Independent Mixed Brigade.; 2. According to the medical department of the North China Front Army, the Japanese Army in North China suffered 2,349 killed and 4,004 wounded fighting Nationalist and Communist guerillas in the region from August until December 1940, of which the Hundred Regiments Offensive accounted for a large portion of the losses. Western sources:; 1. 20,900 Japanese casualties and about 20,000 collaborator casualties Jay Taylor's estimate: 3,000–4,000 casualties Peng's estimate:; 1. 30,000 Japanese and collaborators

The Hundred Regiments Offensive (Chinese: 百团大战) or the Hundred Regiments Campaign was a tactical campaign initiated by the Eighth Route Army, led by the Chinese Communist Party, against the Japanese invasion in North China from 20 August 1940, to 24 January 1941. The operation was named in recognition of the involvement of 105 regiments and represented the most extensive and protracted offensive by the Eighth Route Army in Japanese-occupied territory since the onset of the countrywide War of Resistance. The campaign aimed at undermining the Shijiazhuang–Taiyuan railway, a significant line under Japanese dominion, and spanned several crucial transportation corridors in North China, occurring in three distinct periods. The operation secured substantial strategic advantages, inflicted a severe setback on Japan's "prison cage policy," elevated national morale, and highlighted the crucial role of the Chinese Communist Party and its military as a cornerstone in the Second Sino-Japanese War.