事变

incident / unforeseen event / events (in general)

matter / thing / item / work / affair / CL:件[jian4],樁|桩[zhuang1],回[hui2]

to change / to become different / to transform / to vary / rebellion

Shanghai Incident of 28th January 1932, Chinese uprising against Japanese quarters of Shanghai

Marco Polo Bridge Incident of 7th July 1937, regarded as the beginning of the Second Sino-Japanese War 抗日戰爭|抗日战争[Kang4 Ri4 Zhan4 zheng1]

the Mukden or Manchurian Railway Incident of 18th September 1931 used by the Japanese as a pretext to annex Manchuria / also known as Liutiaogou incident 柳條溝事變|柳条沟事变

Korean war (dating from North Korean invasion on 25th Jun 1950)

the coup of 12th Mar 1927, an attempt by Chiang Kai-shek to suppress the communists / called 反革命政變|反革命政变 or 慘案|惨案 in PRC literature

New Fourth Army Incident of 1940, involving fighting between the Nationalists and Communists

Marco Polo Bridge Incident of 7th July 1937, regarded as the beginning of the Second Sino-Japanese War 抗日戰爭|抗日战争[Kang4 Ri4 Zhan4 zheng1]

North China Incident of October-December 1935, a Japanese attempt to set up a puppet government in north China

Marco Polo Bridge Incident of 7th July 1937, regarded as the beginning of the Second Sino-Japanese War 抗日戰爭|抗日战争[Kang4 Ri4 Zhan4 zheng1]

Xi'an Incident of 12th December 1936 (kidnap of Chiang Kai-shek 蔣介石|蒋介石[Jiang3 Jie4 shi2])