When Li Renfu died in 933, the officers of the circuit supported Li Yichao to succeed him, and he claimed the title of acting military governor, and thereafter sought to be officially commissioned as military governor from
Later Tang. However,
Li Siyuan, the emperor of Later Tang, to which Li Renfu was formally a vassal, had long suspected Li Renfu of being in secret communications with Later Tang's northern rival the
Liao dynasty, and therefore wanted to dislodge Li Yichao from Dingnan. So, he issued an edict commissioning Li Yichao as the acting military governor of nearby Zhangwu Circuit (彰武, headquartered in modern
Yan'an,
Shaanxi), while commissioning Zhangwu's military governor
An Congjin as the acting military governor of Dingwu. He also had Yao Yanchou () the military governor of Jingnan Circuit (靜難, headquartered in modern
Xianyang,
Shaanxi), command 50,000 soldiers, to try to escort An to Dingnan. He also issued an edict addressing the people of Dingnan, stating that he felt that Li Yichao was too young to defend the border region that Dingnan was, stating that if he followed the imperial orders, he would receive the great honors that
Li Congyan and Gao Yuntao () received (after their respective fathers' deaths) and if he disobeyed them, he would receive the disasters that
Wang Du and Li Kuangbin () received. Li Yichao refused to follow Li Siyuan's orders. Rather, he sent his older brother or cousin (only known historically by the nickname of Prince Aluo () to defend against the Later Tang attack at Qingling Gate (青嶺門, in modern Yan'an), and also gathered up all Dangxiang tribesmen in his territory for the defense. The Later Tang forces under Yao and An put Xia Prefecture under siege. However, the city walls were said to be exceedingly firm based on original construction by
Helian Bobo, and the Dangxiang tribesmen were able to effectively cut off food supply routes of the Later Tang army such that it was difficult to resupply the army. Li Yichao and his brothers went on the city walls and begged An to withdraw, stating to him: Upon hearing about this plea, Li Siyuan ordered a withdrawal. It was said that from this point on, Dingnan viewed the imperial government lightly, such that whenever there were rebellions against the imperial government, it would get in communications with the rebels to demand bribes in order to aid them against the imperial government. == As military governor of Dingnan ==