Goryeo-Jurchen Border Conflict

Timeline

1. 1228Changpyeongjin · ChangpyeongjinPuxian Wannu of Dongjin sent troops to attack Goryeo's border again; over a thousand Dongjin soldiers occupied Changpyeongjin in Goryeo's northeast before withdrawing. Around the same time, Dongjin officers Wang Nubi, Liguan Gaolingeng, Langge and others defected to Goryeo, showing both internal instability in Dongjin and pressure on Goryeo's frontier defenses.
2. 1228Gaeseong · GaeseongAfter the border emergency, King Gojong of Goryeo personally set up an Inwang altar at the Seonggyungwan to perform a rite to avert the enemy, and issued an edict ordering civil and military officials of the fourth rank and above, and censors of the sixth rank and above, each to submit strategies for defense. The edict described Dongjin's repeated border incursions—fleeing when pursued, lurking when one withdrew—reflecting court anxiety over the failure of the northeastern defense system.
3. 1228–1229Northeastern border of the Korean Peninsula · Northeastern borderCui Zongzi (Choe Chongja), Goryeo's northeastern military commissioner, sent spies into Dongjin territory to gather intelligence and attempted to mediate relations between the two states through envoys. Though the border conflict did not escalate into full-scale war, it prompted the Choe regime to further strengthen defenses at Uiju, Hwaju and other fortresses, laying groundwork for the subsequent Mongol eastern campaigns and the Dongjin upheaval.