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The Mongol invasions of Korea (1231 - 1270) consisted of a series of campaigns by the Mongol Empire against Koreamarker, then known as Goryeomarker, from 1231 to 1270. There were six major campaigns at tremendous cost to civilian lives throughout the Korean peninsula, ultimately resulting in Korea becoming a vassal of the Mongol Yuan Dynastymarker for approximately 80 years.

The initial campaigns

Gojong of Goryeo (reigned 1213-1259) was the twenty-third king of the Goryeomarker dynasty. In 1225, the Mongol Empire demanded tribute from Goryeomarker and the Mongol envoy Chu-ku-yu was killed. His death was used by the Mongols as an excuse to invade Goryeo.

In 1231, Ögedei Khan ordered the invasion of Koreamarker. The experienced Mongol army was placed under the command of General Sartai. The Mongol army crossed the Yalu river and quickly secured the surrender of the border town of Uijumarker. Choe U mobilized as many soldiers as possible into an army comprised largely of infantry, where it fought the Mongols at both Anju and Kusong. The Mongols took Anju; however, they were forced to retreat after the Siege of Kusong. Frustrated by siege warfare, Sartai instead used his armies' superior mobility to bypass the Goryeo army and succeeded in taking the capital at Gaesong. Elements of the Mongol army reached as far as Chungjumarker in the central Korean peninsula; however, their advance was halted by a slave army led by Ji Gwang-su where his army fought to the death. Realizing that with the fall of the capital, Goryeo was unable to resist the Mongol invaders, Goryeo sued for peace. The cost of tribute was immense. The Mongols demanded 10,000 otter skins, 20,000 horses, 10,000 bolts of silk, clothing for 1,000,000 soldiers and a large number of children and craftsmen who would become slaves and servants of the Mongol empire. General Sartai began withdrawing his main force to the north in the spring of 1232, leaving seventy-two Mongol administrative officials stationed in various cities in northwestern Koryo to ensure that Koryo kept his peace terms. But Ch'oe U resolved not to accept the Mongol occupation without resistance.

In 1232, Choe U, against the pleas of both King Kojong and many of his senior civil officials, ordered the Imperial Court and most of Gaesong's population to be moved from Songdomarker to Ganghwa Islandmarker in the Bay of Gyeonggimarker, and started the construction of significant defenses to prepare for the Mongol threat. Choe U exploited the Mongols' primary weakness, fear of the sea. The government commandeered every available ship and barge to transport supplies and soldiers to Ganghwa Island. The evacuation was so sudden that King Kojong himself had to sleep in a local inn on the island. The government further ordered the common people to flee the countryside and take shelter in major cities and mountain citadels or nearby offshore islands. Ganghwa Island itself was a might defensive fortress. Smaller fortresses were built on the mainland side of the island and a double wall was also built across the ridges of Mt. Munsusan.

The Mongols protested the move, and immediately launched a second attack. The Mongol army was led by a traitor from Pyongyang called Hong Pog-won and the Mongols occupied much of northern Korea. Although they reached parts of the southern peninsula as well, the Mongols failed to capture Ganghwa Island, which was only a few miles from shore, and were repelled in Gwangjumarker. The Mongol leader Sartai (撒禮塔) was killed by a monk Kim Yun-hu (김윤후) amidst strong civilian resistance at the Battle of Cheoinseong near Yonginmarker, forcing the Mongols to withdraw again.

Third campaign and treaty

In 1235, the Mongols began a campaign that ravaged parts of Gyeongsang and Jeolla Provinces. Civilian resistance was strong, and the Imperial Court at Ganghwa attempted to strengthen its fortress. Goryeo won several victories but the Goryeo military and Righteous armies could not withstand the waves of invasions. In 1236, Gojong ordered the re-creation of the Tripitaka Koreanamarker, destroyed during the 1232 invasion. This collection of Buddhist scriptures took 15 years to carve on some 81,000 wooden blocks, and is preserved to this day. After the Mongols were unable to take either Ganghwa Island or Goryeo's mainland mountain castles, the Mongols began to burn Goryeo farmland in an attempt to starve the populace. When some fortresses finally surrendered, the Mongols executed everyone who resisted them.

In 1238, Goryeo relented, and sued for peace. The Mongols withdrew, in exchange for Goryeo's agreement to send the Imperial Family as hostages. However, Goryeo sent an unrelated member of the imperial line. Incensed, the Mongols demanded clearing the seas of Korean ships, relocation of the court to the mainland, the hand-over of anti-Mongol bureaucrats, and, again, the Imperial family as hostages. In response, Korea sent a distant princess and ten children of nobles, rejecting the other demands.

Fourth and fifth campaigns

In 1247, the Mongols began the fourth campaign against Goryeo, again demanding the return of the capital to Songdo and the Imperial Family as hostages. Guyuk sent Amuqan to Koreamarker and the Mongols camped near Yomju in July 1247. After the king Gojong of Goryeo refused to move his capital from Ganghwa island to Songdo, Amuqan's force pillaged the Korean Peninsula. With the death of Guyuk Khan in 1248, however, the Mongols withdrew again. But the Mongol raids continued until 1250.

Upon the 1251 ascension of Mongke Khan, the Mongols again repeated their demands. Mongke Khan sent envoys to Goryeomarker, announcing his coronation in October 1251. He also demanded the King Gojong be summoned before him in person and his headquarters be moved from Ganghwa Islandmarker to the Korean mainland. But the Goryeo court refused to send the king because the old king was unable to travel so far. Mongke again dispatched his envoys with specific tasks. The envoys were well-received by the Goryeo officials but they also criticized them, saying their king did not follow his overlord Mongke's orders. Mongke ordered the prince Yeku to command the army against Korea. However, a Korean in the court of Mongke convinced them to begin their campaign in July 1253. Yeku, along with Amuqan, demanded the Goryeo court to surrender. The court refused but did not resist the Mongols and gathered the peasantry into the mountain fortresses and islands. Working together with the Goryeo commanders who had joined the Mongols, Jalairtai Qorchi ravaged Korea. When one of Yeku's envoys arrived, Gojong personally met him at his new palace in Sin Chuan-bug. Gojong finally agreed to move the capital back to the mainland, and sent his step son, Angyeong, as a hostage. The Mongols agreed to a cease fire in January 1254.

Sixth campaign and peace

The Mongols later learned that top Goryeo officials remained on Ganghwa Island, and had punished those who negotiated with the Mongols. Between 1253 and 1258, the Mongols under Jalairtai launched four devastating invasions in the final successful campaign against Korea.

Mongke realized that the hostage was not the blood prince of the Goryeo Dynasty. So Mongke blamed the Goryeo court for deceiving him and killing the family of Lee Hyeong, who was a pro-Mongol Korean general. Mongke' commander Jalairtai devastated much of Goryeo and took 206,800 captives in 1254. Famine and despair forced peasants to surrender to the Mongols. They established a chiliarchy office at Yonghung with local officials. Ordering defectors to build ships, the Mongols began attacking the coastal islands from 1255 onward. In the Liaodongmarker Peninsula, the Mongols eventually massed Korean defectors into a colony of 5,000 households. In 1258, the king and the Choe clan retainer Kim Unjin staged a counter-coup, assassinated the head of the Choe family and sued for peace. When the Goyeo court sent the future king Wonjong as hostage to the Mongol court and promised to return to Kaegyong, the Mongols withdrew from Central Korea.

There were two parties within Goryeo: the literati party, which opposed the war with the Mongols, and the military junta — led by the Choe clan — which pressed for continuing the war. When the dictator Choe was murdered by the literati party, the peace treaty was concluded. The treaty permitted the maintenance of the sovereign power and traditional culture of Goryeo, implying that the Mongols gave up incorporating Goryeo under direct Mongolian control and were content to give Goryeo autonomy, but the king of Goryeo must marry a Mongolian princess and be subordinate to the Great Khans.


Internal struggles within the royal court continued regarding the peace with the Mongols until 1270.

Since Choe Chung-heon, Goryeo had been a military dictatorship, ruled by the private army of the powerful Choe family. Some of these military officials formed the Sambyeolcho Rebellion (1270-1273) and resisted in the islands off the southern shore of the Korean peninsula.

Beginning with Wonjong, for approximately eighty years, Korea was a tributary of the Mongols Yuan Dynastymarker. The Mongols and Korea were tied by marriages as Mongol princes married Korean princesses and Korean princes married Mongol princesses. A Korean princess called the Qi Empress became an empress through her marriage with Ukhaantu Khan, and her son, Biligtü Khan of Northern Yuan, became a Mongol Khan. King Chungnyeol of Goryeo married a daughter of Kubilai Khan, and marriages between the Mongols and Korea continued for eighty years.

The Goryeo dynasty survived under Mongolian influence until King Gongmin began to push Mongolian garrisons back starting in the 1350s.

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