Unit 731 was one example of wartime atrocities committed on a civilian population during World War II , where experiments were performed on thousands of Chinese and Korean civilians as well as Allied prisoners of war . In military campaigns , the Imperial Japanese Army used biological weapons and chemical weapons on the Chinese , killing around 400,000 civilians . The Nanking Massacre is another example of atrocity committed by Japanese soldiers on a civilian population
Unit 731
Unit 731
Pacific War