This article is about the chemical agent used in the attack on Yichang during the Sino-Japanese War in 1940 and which side of the conflict or both would employ it. What type of agent was used, if any? Methods of use used to disperse the chemical agent in times of war. Finally, I examined situations in which the agent would be employed by military forces to achieve maximum effectiveness. A brief description of Unit 731, its commander, and a little of what was explained. The next key point is a brief summary of the actual war preceding the use of the incident and the attack itself. The war is followed by research into the chemicals actually used during the article, a light history of the war and. We then explain the main battle in which the chemical was used. Next, chemical mustard gas is detailed in terms of prosperity and symptoms. Chemical Use in the Yichang Attack The Sino-Japanese War fought on Chinese soil between the years 1937 and 1941 ushered in a biological and chemical warfare zone for Japanese military forces. Researchers believe that, among more than 2,000 known incidents, Japanese military units would use these munitions during World War II, which would begin in China. The main reasons Japan would use these weapons was because of mass casualties that forced them to retreat, prevented them from taking certain terrain, or allowed Japanese elements to retreat. Shiro Ishii managed to convince the high command of the necessity and importance of using biological weapons. and chemical weapons. Unit 731 would be formed under his leadership and transferred to China where the Japanese army would secure the Manchuria region. Extensive research...... middle of paper ...... five chemical reactions. Symptoms Eye contact presents in two forms and at different times: ocular symptoms within 4 to 6 hours and corneal edema within 1 hour. Symptoms include pain, photophobia, blepharospasm, tearing, conjunctivitis, corneal lesions, eyelid blisters and infections. Short- and long-term effects that may occur include blindness, although this may disappear within 10 days. Works cited by Dick Wilson (1982). When Tigers Fight: The History of the Sino-Japanese War 1937-1945. Frank Dorn (1974). The Sino-Japanese War 1937-51. Peter Williams, David Wallace (1989). Unit 731: Japan's secret biological warfare during World War II. Seth Schonwald MDABMT (July 1992). Mustard gas. The PSR Quarterly Vol. 2 No. 2Sheldon H. Harris (2002). Factories of death: Japanese biological warfare, 1932-1945, and the American cover-up.