Zhou Dewei
Soon thereafter, with Lu Wenjin as their guide, the Khitan army launched a major attack on Jin's northern borders, quickly capturing Xin Prefecture. Lu made his subordinate Liu Yin () its prefect. When, under Li Cunxu's orders, Zhou Dewei then came to attack Xin with his own Lulong army, reinforced by armies of Jin's Hedong (河東, headquartered in modern Taiyuan, Shanxi), as well as the armies of Jin's allies Zhao and Yiwu Circuit (義武, headquartered in modern Baoding), Zhou was defeated by a massive (300,000 men) Khitan army, and was forced to withdraw back to Lulong's capital You Prefecture (幽州, i.e., Fanyang), which, under advice from Lu, the Khitan army put him under siege. While a subsequent Jin army, commanded by the major generals Li Siyuan, Yan Bao (), and Li Cunshen, were able to lift the siege and force a Khitan retreat, the Lulong/Khitan boundary had been left vulnerable. Emperor Taizu thereafter gave Lu the title of military governor of Lulong as well, stationing him and his ethnic Han soldiers at Ping Prefecture (平州, in modern Qinhuangdao, Hebei). Each year, he would guide Khitan's ethnic Xi soldiers on incursions into Jin territory, as well as on the more major attacks on Jin. The food shipments to Lulong were often pillaged by the Khitan forces, leaving Lulong's prefectures in distress.