Anti-Japanese Invasion War (China)

What happened

Japan's full-scale invasion of China in 1937 followed a decade of piecemeal aggression. The Kuomintang under Chiang Kai-shek and Communist forces under Mao agreed to a United Front. Early Japanese victories captured Shanghai, Nanjing (followed by horrific atrocities), and northern provinces, but extended supply lines and fierce Chinese resistance bogged Japan down. Key battles included Nanjing (December 1937), the Shanghai campaign, and the Battle of Wuhan. Chinese armies traded space for time, retreating inland to Chongqing while conducting devastating guerrilla operations. By 1945, Japan's surrender in WWII ended the war; China emerged as an Allied power but economically devastated.

Why it mattered

The war killed 15-20 million people and set the stage for China's subsequent civil war victory and Communist ascendancy. It transformed China into a significant geopolitical power and demonstrated the limits of Japanese expansionism in Asia. The war's brutality (Rape of Nanjing) shocked the world and contributed to war crimes tribunals.