Jia Sidao
Political infighting in the Song also contributed to the fall of Xiangyang and Fancheng, due to the power of the Lu family. Many questioned their allegiance to the Song as morale was collapsing, and the Emperor barred Jia Sidao himself from the command. Li Tingzhi, an enemy of the Lu family, was appointed commander. Jia permitted the Lu 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.