This is a list of the campaigns and military conflicts of the Japanese during the Second Sino-Japanese War. It is not comprehensive. Prior operations and events Shantung Incident (1927–1928) Mukden Incident (September 18, 1931) Harbin Incident (January, 1932) First Battle of Shanghai (January 28, 1932) Signing of the Wusung-Shanghai accord (March 4, 1932) First battle of Hopei (Operation Nekka) (March, 1933) First actions in Chahar (1933) Actions in Interior Mongolia (1935) Suiyuan Campaign (1936) Japanese combats in the China campaign proper (1937-45) Lukouchiao bridge incident = Marco Polo Bridge Incident July 1937 Second battle of Hopei July 1937 Tientsin Incident July 1937 Operation Chahar August 1937 Battle of Wusung-Shanghai, Second battle of Shanghai August 1937 Battle of Nanking December 1937 Crossing of Yangtze and Hwai Battle of Linchi Battle of Taierzhuang Battle of Hofei Battle of Tingyuan Crossing of Hwai river The Imperial Japanese Army Air Force carried out the first transoceanic air raid in history, with bombers taking off from Taiwan and Japan flying over the China Sea to the Chinese mainland, in 1937. The Chinese retaliated with the Taihoku Air Strike in (Formosa) during January 1938 when some Chinese bombers struck the city. These are the first hostile air attacks to Japanese soil during the Pacific War before the Doolittle Raid. Japanese control of Tientsin-Pukow rail lines Battle of Hsuchow (May - June 1938) Battle of Langfeng Battle of Lowang Battle of Kueiteh Crossing of Yangtze river Battle of Wuhan (June–November 1938) Battle of Matang Battle of Huoko Battle of Chuichiang Chinese Strategic retreat to West areas. Japanese front lines of Paotou, Fenglingtu, Kaifeng, Hsinyang, Yuehyang, and Hangchow Since the beginning of the conflict, Japanese Air forces maintained aerial superiority. However, this was weakened by the "Flying Tigers" of Claire Chennault during 1941, and direct aid in 1942 of the USAAF joining Chinese Air forces. The Japanese reinforced Manchukuo and Chosen with 14 divisions and 2 air fleets to prevent any Soviet attacks. They also established 7 divisions as reserves in Taiwan and Japan for defensive purposes. The United States announced the Strategic prime materials embargo against Japan (July 1, 1938). First Japanese offensive attempt in Changkufeng Incident against Soviets (July 1938) Japan sent additional mobile forces to the Wuhan area for attacking weak Chinese groups in limited offensives. The Japanese Bacteriological air attack by Units 731 and 1644 launched contaminated, plague-ridden food and clothing against Kaimingyie, the