王都
Shortly after, Li Cunxu put Chengde's capital Zhen Prefecture () under siege. Wang Yu persuaded Liao's Emperor Taizu to aid the Chengde rebels, and Emperor Taizu agreed. In winter 921, he marched through Lulong, and then attacked Yiwu's capital Ding Prefecture (). Wang Du sought emergency aid from Li. Li headed for Ding to aid Wang Du.