10. Japanese Military Against Chinese Cities, 1940-1942: 2400 Casualties, 10,000 Wounded
The Sino-Japanese War saw some of the most atrocious war crimes in history. At the time, though, the world was too embroiled in World War II to be able to provide any assistance. From 1940 until 1942, the Japanese military deliberately targeted Chinese cities with bioagents.
Cholera and other diseases were disseminated among Chinese civilians when the Japanese military contaminated the water supply. This was in addition to chemical attacks being launched. The attacks were so extensive that some Japanese soldiers also died from the damage.
