1231 – 1270
A series of campaigns were conducted between 1231 and 1270 by the Mongol Empire against the Korean kingdom of Goryeo. The last campaign concluded with a peace treaty with Goryeo becoming a vassal state of the Yuan dynasty, a relationship that lasted for approximately 80 years. Korea and the Song Dynasty of China put up a greater amount of "stubborn resistance" towards the Mongol invasions than many others in Eurasia who were swiftly crushed by the Mongols at a lightning pace.
1231 – 1232
The siege of Kuju (Korean: 귀주성전투) which occurred in 1231 was a decisive Goryeo victory against the Mongol Empire during the First Mongol Invasion of Korea. After the Mongol army crossed the Yalu river, it quickly captured almost all of Goryeo's border defenses. The Mongol army, however, ran into stiff resistance both at Anju and the city of Kuju, commanded by General Park Seo.
1232
The Battle of Cheoin was a battle between Goryeo militants and forces of the Mongol Empire in Cheoin-bugok, Suju, Yanggwang-do on December 16, 1232. Despite being outnumbered, civilian forces of the fortress managed to hold off the Mongol advance. Following the death of the Mongolian general Saritai, the invading force withdrew, effectively ending the second Mongol invasion of Korea.