Lantern slide of Tien Tsin Ruins. The Tientsin Massacre (Tianjin Religious Case), one of the most important 'missionary incidents' of the late Qing Dynasty, involved attacks on French Catholic priests and nuns, violent belligerence from French diplomats, and armed foreign intervention in Tientsin (Pinyin 'Tianjin') in 1870. The incident marked an end to comparative cooperation between foreign powers and the Tongzhi Manchu court, and adversely affected the ongoing renegotiation of the Treaties of Tientsin, first signed in 1858.. Part of Box 159 Pekin, slide no 6