Unit 113 was a covert was a covert biological and chemical warfare research unit of the Imperial Japanese Army, established in Burma in 1941 during the Second World War. Unit 113's first major success came in summer of 1941, when it dropped by bomber porcelain bomb casings full of cholera baccili and rodents infected with plague into Yunnan Province, in China, which received some supplies from the British in India. This plan continued throughout the year, earning the camp a special comendation from the War Ministry.