Second Sino-Japanese War

The Second Sino-Japanese War (1937-1945) was a major invasion of eastern China by Japan preceding and during World War II. It ended with the surrender of Japan in 1945. In Chinese, the war is variously known as the Chinese People's Anti-Japanese War of Resistance (????????), Anti-Japanese War of Resistance (????), War of Resistance (??), or Eight Years' War of Resistance (????).

Number of troops involved

Chinese side

• The KMT Army had approximately 4,300,000 regulars.
• The number of those on the CCP side, due to their guerilla status, is difficult to say, though estimates place the total number of the Eighth Route Army, New Fourth Army, and irregulars at 1,300,000.

See more information of combat effectiveness of 8° and 4° Route Communist Armies and other units of Chinese forces:

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• Combat effectiveness of Chinese armies in the Second Sino-Japanese War

Japanese side

• The IJA had 2,000,000 regulars.
• The Collaborationist Chinese Army (:zh:??) formed approximate 2,100,000, the only collaborationist army in WW2 which outnumbered the invading army.

About Japanese personal observations in very hard life in Chinese combat front see:

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• Observations of Japanese Soldier in Chinese front