The July 7th Incident。

The July 7th Incident, also known as the Marco Polo Bridge Anti-Japanese War, the Marco Polo Bridge Incident, and the Marco Polo Bridge Incident, was a military incident between the Chinese Garrison Army of Japan and the 29th Army of the National Army stationed there on July 7, 1937 in Lugou Bridge, Wanping County, Hebei Province. The conflict is considered to be the starting point of the full-scale outbreak of China's Anti-Japanese War.