On September 1860, 18, the British and French invaders captured Tongzhou. On 2 1 day, the Qing army and the British and French allied forces launched a fierce battle at Baliqiao, and the commander-in-chief monk Qin and others took the lead in fleeing. The invading army burned and looted all the way, plundering the precious cultural relics, gold and silver jewelry in Yuanmingyuan, which was operated by the Qing court for a long time, and completely burned the buildings in the park. 101On October 24th and 25th, Yixin exchanged the ratification documents of Tianjin Treaty with Erjin and Ge Luo respectively, and concluded the unequal Beijing Treaty between China, Britain and France. At this point, the Opium War ended.