Yu Jie

Timeline

1. 1243Chongqing · SichuanIn the third year of Chunyou Yu Jie was appointed Pacification Commissioner of Sichuan, taking overall charge of military and civil affairs in the region. Assessing the situation, he proposed a strategy of holding key passes with mountain-fortress strongpoints and resisting the Mongols over the long term, which won the support of Lizong's court.
2. 1244–1250Diaoyu Fortress · HezhouYu Jie built dozens of mountain fortresses such as Diaoyu Fortress and Qingju Fortress on a large scale in Sichuan, relocating people to populate the frontier and storing grain and weapons, forming a network of mutually supporting mountain fortresses that effectively curbed the Mongol cavalry's mobility advantage on the plains.
3. 1247Sichuan · SichuanIn the seventh year of Chunyou the Mongol army invaded Sichuan in force; Yu Jie organized defenses along the mountain-fortress system, repelling Mongol attacks at strongpoints on multiple routes, preserving Sichuan's core defense zone and making the region the Southern Song's most secure southwestern bulwark.