Lü Wenhuan's defense of Xiangyang and the Southern Song's last line

Timeline

1. 1271Xiangyang · HubeiThe Southern Song appointed Lü Wenhuan as prefect of Xiangyang, commanding the garrison of the Jing-Xiang defense line. Yuan generals Azu, Liu Zheng, and others led large armies in a prolonged siege of Xiang-Fan, constructing siege works, blockading the Han River, and employing a strategy of besieging the point while defeating relief forces, cutting off Song reinforcements by land and water.
2. 1271–1272Xiang-Fan · HubeiThe Yuan army destroyed the pontoon bridges between Xiangyang and Fancheng, preventing the two cities from aiding each other. Southern Song forces under Li Tingzhi, Zhang Shijie, and others attempted relief several times but were repelled; food and supplies ran out in the city, and soldiers and civilians tore down houses for firewood. Court infighting and Duzong's misgovernance meant the relief forces never broke the Yuan blockade.
3. 1273Xiangyang · HubeiIn the first month of 1273, the Yuan army breached Fancheng with Huihui trebuchets, and defender Niu Fu died in battle. Arikhaya turned on Xiangyang, snapping an arrow to swear he would spare the city, and Lü Wenhuan, moved to tears, surrendered. The loss of Xiang-Fan collapsed the Southern Song's mid-Yangtze defense line, becoming the turning point in the Song-Yuan transition.