The Battle of Shanghai was fought between the forces of The Republic of China and the Empire of Japan ending with Japanese victory. In 1937 undeclared war broke out after the Marco Polo incident and Japanese troops pressed towards Shanghai and eventually Nanking.Tensions between China and Japan began after Mukden incident in 1931 in which japanese forces detontated explosives near Manchuria. The Tanngu Truce ended tensions however war erupted again in 1937. When both sides clashed near peking (now bejing) Japanese troops pressed towards Peking, Shanghai and evenutally, Nanking

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