Jianwen Emperor
In the immediate aftermath of Battle of Jia River-Gaocheng, the Yan forces took the initiative and marched southwards with no resistance. Zhu Di demanded peace talks, and Jianwen Emperor consulted with advisor Fang Xiaoru for opinions. Fang Xiaoru suggested to pretend to negotiate while ordering the forces in Liaodong to strike Beiping. The strategy did not work as planned, and in May Sheng Yong sent out an army to attack the supply line of the Yan Army. Zhu Di claimed that Sheng Yong refused to stop military actions with ill intentions, and managed to convince Jianwen Emperor to imprison Sheng Yong.