Did China fight in WW2?

China fought in WW2 against Japan that had invaded its eastern portion in 1937. The scale of China’s involvement in the war was massive. So was the scale of its casualties. 

Some 14 million Chinese died and up to 100 million became refugees during the eight years of the conflict with Japan from 1937 to 1945. 

For further reading check the following articles:

• World War I
• World War II
• Causes of World War I