Du Chongwei
In 946, Emperor Taizong decided to create a trap for Later Jin. He spread false news that Zhao Yanshou was intending to defect to Later Jin, rumors that were believed by Feng and Li Song. They had Du Chongwei (whose name had been changed to Du Wei by that point due to naming taboo for Shi Chonggui's name), who was then the military governor of Tianxiong, write a secret letter to Zhao, to see if Zhao intended to defect. Zhao, who was part of Emperor Taizong's plan, wrote back and indicated that, indeed, he wanted to defect, along with his Lulong Circuit (盧龍, headquartered in Beijing — which had previously been Later Tang territory but which Shi Jingtang, as part of the agreement in which Emperor Taizong aided him to become emperor, ceded to Emperor Taizong); in his letter, he asked for a major Later Jin army to be launched to support his defection. After discussions between Shi Chonggui, Feng, and Li Song, it was agreed that a large army would be launched, commanded by Du, with Li Shouzhen serving as his deputy. (This was opposed by Zhao Ying, who believed that Du was untrustworthy due to his unthankful nature, but Zhao Ying was not listened to.)