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China / Japan: Japanese Special Naval Forces deployed for gas and/or chemical warfare, Battle of Shanghai, 1937

China / Japan: Japanese Special Naval Forces deployed for gas and/or chemical warfare, Battle of Shanghai, 1937

The Battle of Shanghai (1937), known in Chinese as the Battle of Songhu, was the first of the twenty-two major engagements fought between the National Revolutionary Army of the Republic of China and the Imperial Japanese Army of the Empire of Japan during the Second Sino-Japanese War. It was one of the largest and bloodiest battles of the entire war.

According to historians Yoshiaki Yoshimi and Kentaro Awaya, gas weapons, such as tear gas, were used only sporadically in 1937 but in early 1938, the Imperial Japanese Army began full-scale use of sneeze and nausea gas (red), and from mid-1939, used mustard gas (yellow) against both Kuomintang and Communist Chinese troops.

According to historians Yoshiaki Yoshimi and Seiya Matsuno, the chemical weapons were authorized by specific orders given by Emperor Hirohito himself, transmitted by the chief of staff of the army. For example, the Emperor authorized the use of toxic gas on 375 separate occasions during the Battle of Wuhan from August to October 1938.

They were also profusely used during the invasion of Changde. Those orders were transmitted either by prince Kotohito Kan'in or general Hajime Sugiyama. The Imperial Japanese Army used mustard gas and the US-developed (CWS-1918) blister agent Lewisite against Chinese troops and guerrillas. Experiments involving chemical weapons were conducted on live prisoners (Unit 731 and Unit 516).

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