In July 1937, on the night of July 7, the Japanese in Peiping southwest near the Marco Polo Bridge exercises, an excuse for a soldier "missing", requested access to search Wanping County, was China's 29th Army garrison Yanci refused. Then to the Japanese Chinese defenders shot, and shelling Wanping city. Twenty-ninth army to rise up against the war. This is the 77 incident shocked the Chinese and foreign, also known as the Lugou Bridge incident. The 77 incident is the beginning of the Japanese imperialist war of aggression against China, but also the starting point for the Chinese nation to conduct a comprehensive anti Japanese war.