Wang Du
Meanwhile, Wang Du was apprehensive about his relations with the imperial government, as Li Siyuan's administration, under An's auspices, had been stricter with military governors than Li Cunxu's had been. In addition to Wang Jianli, he was also sending secret correspondences to Huo Yanwei, then the military governor of Pinglu Circuit (平盧, headquartered in modern Weifang, Shandong); Fang Zhiwen (房知溫) the military governor of Zhongwu Circuit (忠武, headquartered in modern Xuchang, Henan); Mao Zhang the military governor of Zhaoyi Circuit; Meng Zhixiang; and Dong Zhang, hoping to alienate them from the imperial government. He similarly tried to entice Wang Yanqiu (i.e., Du Yanqiu, who had returned to his birth name) the military governor of Guide Circuit (歸德, headquartered in modern Shangqiu, Henan), who was then commanding the northern defense forces against Khitan, into an alliance, but when Wang Yanqiu rejected his overtures, unsuccessfully tried to have Wang Yanqiu assassinated. When Wang Yanqiu reported this to the imperial government, Li Siyuan ordered a general campaign against Wang Du, with Wang Yanqiu in command. Wang Yanqiu put Yiwu's capital Ding Prefecture (定州) under siege immediately, but chose to wear out Wang Du by surrounding the well-fortified city, rather than launch heavy assaults on it. Khitan's attempt to aid Wang Du was unsuccessful, and in early 929, Wang Du's officer Ma Rangneng (馬讓能) opened the city gates to allow the Later Tang forces in; Wang Du committed suicide, ending the campaign.