雁门关
In 936, believing that Shi might rebel anyway and that he should catch Shi unprepared, Li Congke issued an edict moving Shi from Hedong to Tianping Circuit (天平, headquartered in modern Tai'an, Shandong) and making the imperial guard general Song Shenqian () the military governor of Hedong. Fearful of the consequences, Shi summoned his key officers and sought their advice. Zhao Ying recommended that he report to Tianping. Xue Rong () was noncommittal. Liu recommended resistance, a recommendation that joined by Sang Weihan, who further suggested that he seek aid from Khitan's Emperor Taizong. Shi agreed, and had Sang draft a petition for him in which he offered to submit to Emperor Taizong as subject and son and to cede Lulong Circuit (盧龍, headquartered in modern Beijing) and Hedong's prefectures north of the Yanmen Pass to Khitan. Liu argued against the contents of the petition, finding it too humiliating to submit as a "son" in addition to be subject, and also finding the cession to be unnecessary, but Shi did not listen to him.