The Tungchow Mutiny (Japanese: 通州事件 Hepburn: Tsushu jiken, Chinese: 通州事件; pinyin: Tōngzhōu Shìjiàn), sometimes referred to as the Tongzhou Incident, was the massacre of Japanese civilians and troops by East Hopei Army in Tongzhou, China on 29 July 1937 shortly after the Marco Polo Bridge Incident that marked the official beginning of the Second Sino-Japanese War. 223 of the 385 Japanese denizens were killed.