Joseon's Reaction to Ming's Advancement into Liaodong
Historically, the Liaodong region has been a geographical hub connecting Manchuria, northern China, Mongolia, and the Korean peninsula. The transition of power in the region was a major factor in the northward policies of the Korean kingdoms of Goryeo and Joseon. Like the Mongol-controlled Yuan dynasty, the Ming dynasty ruled by the Han Chinese also strived to secure control over the eastern regions including the Liaodong region as it unified the central plain. Evidence of this was the five fortresses―Dongzhoubao (東州堡), Magendanbao (馬根單堡), Qinghebao (淸河堡), Jianyangbao (鹻陽堡), and Aiyangbao (靉陽堡)―the Ming dynasty built between Fushun and the Amnok River to the east of a succession of eight post stations The eight post stations installed between Joseon and the Ming dynasty were Zhenjiangcheng (鎭江城), Tangzhan (湯站), Shanmen (柵門), Fenghuangcheng (鳳凰城), Zhendongbao (鎭東堡), Zhenyibao (鎭夷堡), Lianshanguan (連山關), and Tianshuizhan (甛水站).
between Liaoyang and the Amnok River.
Lee Jeong-il (Research fellow, NAHF Research Institute of Ancient-Medieval Korean History)