The war claimed tens of millions of lives and displaced countless more, as entire cities were reduced to rubble and civilian populations faced massacres, forced labor, and famine.
In response, the Kuomintang (KMT) and the Communist Party of China (CPC) formed a united front against the Japanese invasion. As Nationalist forces fought a series of major engagements, Communist troops led guerrilla operations and established resistance strongholds behind enemy lines.