Zhou Dewei
In 902, Li Keying's archenemy Zhu Quanzhong, after his Xuanwu (宣武, i.e., Bian Prefecture) army, commanded by his general Shi Shucong (氏叔琮) and nephew Zhu Youning (朱友寧), defeated the Hedong army commanded by Li Siyuan's adoptive brother Li Sizhao and Zhou Dewei at Pu County (蒲縣, in modern Linfen, Shanxi), ordered Shi and Zhu Youning to advance to Hedong's capital Taiyuan to put it under siege. With a substantial portion of Li Keyong's army not available at that time at Taiyuan, the city appeared that it would be falling, and Li Keyong considered abandoning it and fleeing to Yun Prefecture (雲州, in modern Datong, Shanxi) — a strategy that Li Cunxin advocated. However, Li Siyuan, along with Li Sizhao and Zhou, advocated steadfast defending the city, and they, as well as Li Keyong's wife Lady Liu, were able to convince Li Keyong to stay and defend the city. Subsequently, raids that Li Sizhao and Li Siyuan lead against the Xuanwu army disrupted the Xuanwu army's food supplies, and Zhu Quanzhong decided to order its withdrawal. (Still, because of this siege, for several years, Li Keyong did not dare to again battle Zhu for supremacy of northern China.)