Jia Sidao
Political infighting among the Song also contributed to the fall of Xiangyang and Fancheng; due to the power of the Lü family, many questioned their allegiance to the Song. The Emperor barred Jia Sidao himself from the command, so Li Tingzhi, an enemy of the Lü family, was appointed commander. Jia permitted the Lüs to ignore Li's orders, resulting in a fractious command. Li was then unable to relieve Xiangyang and Fancheng, managing only temporary resupply during several breaks in the siege.