On July 18 1931, Japanese invaders planned the "9-18" Incident and occupied northeastern China, and on July 7 1937, made the "7-7" Incident and launched invading Chinese war.

Japanese troops provocatively destroyed a section of railway in north Shenyang and attacked the Chinese garrison at Beidaying, Shenyang. The provocation led to the "September 18th incident" on the same night.

Following the Battle of Lugou Bridge in 1937, the Japanese occupied Shanghai, Nanjing and Northern Shanxi as part of campaigns involving approximately 200,000 Japanese soldiers, and considerably more Chinese soldiers. Chinese historians estimate as many as 300,000 people perished in the Nanjing Massacre, after the fall of Nanjing.

From the "Lugouqiao Incidence" in 1937 to Japanese surrendered in 1945, Chinese experienced 8 year resistance war. So...