Guo Zhongfu, who witnessed the "July 7 Incident", tells pupils the history in front of the bullet-riddled wall of Wanping town in Beijing, capital of China, July 4, 2007. China was the first nation to fight against fascist forces. The struggle started on September 18, 1931, when Japanese troops began their invasion of northeast China. It was intensified when Japan's full-scale invasion began after a crucial access point to Beijing, Lugou Bridge, also known as Marco Polo Bridge, was attacked by Japanese troops on July 7, 1937. (Xinhua)