Battle of China was number six in the Why We Fight series, a group of government-sponsored documentaries aimed at explaining World War II to the American home front. The film describes the rape of China at the hands of the Japanese warlords. Once China is enslaved, Japan uses the captured land and its facilities to overwhelm the rest of Asia. Included are scenes of wartime atrocities--some filmed by the Japanese as proof of their invincibility. Frank Capra directed Battle of China, as he did all seven of the Why We Fight films.