李存勗
Zhu Yougui, knowing that Zhu Youqian would not follow his orders, commissioned the general Han Qing () to attack Zhu Youqian. Zhu Youqian therefore surrendered Huguo Circuit to Jin's prince Li Cunxu, seeking for Jin aid. Zhu Yougui therefore sent the general Kang Huaizhen () the military governor of Ganhua Circuit (感化, headquartered in modern Weinan, Shaanxi) against Zhu Youqian, with Han serving as Kang's deputy. Kang and Niu Cunjie () the military governor of Zhongwu Circuit (忠武, headquartered in modern Weinan as well) subsequently launched an intense siege on Huguo's capital Hezhong Municipality (). Li Cunxu sent his adoptive brothers Li Cunshen, Li Sigong (), and Li Si'en () to aid Zhu Youqian, and he himself then personally headed to Huguo to intercept Kang. Li Cunxu defeated Kang at Jie County (解縣, in modern Yuncheng), forcing Kang to withdraw back to Shan Prefecture (陝州, the capital of Baoyi, now named Zhenguo ()). In gratitude, Zhu Youqian personally went to Li Cunxu's camp with only unarmed guards to thank him. He honored Li Cunxu as if Li Cunxu were a maternal uncle and bowed to Li Cunxu. Li Cunxu held a feast for Zhu, kept Zhu at his tent overnight, and held another feast for Zhu the next day, before Zhu departed. It was said that as Zhu slept, Li Cunxu looked at him and commented, "The Prince of Ji truly has an honored physique, except for his arms being short."