Zhao Yanshou
In 946, there were rumors that Zhao Yanshou was planning on defecting to Later Jin. This rumor was believed by the Later Jin chiefs of staff Li Song and Feng Yu. They had Du write a letter to Zhao, encouraging him to do so, with the officer Zhao Xingshi (sharing the name that Zhao Yanshou's father used to use), who had previously served under Zhao Yanshou, delivering the letter. Zhao Yanshou wrote back (to try to lead Later Jin forces into a trap), stating, "I have long been in a foreign land, and I want to return to China. Please launch a major army to support me, so that I can pull myself out and return with it." Subsequently, under Emperor Taizong's orders, Liao's prefect of Ying Prefecture (瀛州, in modern Cangzhou), Liu Yanzuo (), also offered to defect to Later Jin. Shi thus put Du and Li Shouzhen in command of an army to attack north, with the stated objectives being to first recapture the prefectures previously ceded to Liao, and then to destroy Liao. When Du and Li Shouzhen advanced, though, they were met by a large army that Emperor Taizong personally commanded. The Liao army eventually surrounded the Later Jin army at Zhongdu Bridge (中度橋, in modern Baoding). After Emperor Taizong made the promise to Du to make "him" emperor if he surrendered, Du and Li Shouzhen surrendered their army. Emperor Taizong had Zhao comfort the Later Jin soldiers and told him that the Later Jin army was now his, and then prepared to advance south. With virtually the entire Later Jin army having been given to Du and Li Shouzhen for this northern campaign, then-Later Jin capital Daliang was left essentially defenseless, and Shi Chonggui felt compelled to surrender, ending Later Jin. Emperor Taizong subsequently entered Daliang.