This undated copied file photo shows Chinese soldiers keeping guard on the wall of Wanping County after an attack by invading Japanese troops. A batch of file recording Lugouqiao Incident during the anti-Japanese war were released by Chongqing Beibei District Archive on July 6, 2015. On July 7, 1937, Japanese aggressors first bombarded Wanping County Town, then attacked the Lugouqiao Bridge to start a full-scale war of aggression against China in an attempt to put all the country under its colonial rule. (Photo/Xinhua)
