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Oei Invasion
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The Oei Invasion (known in Korea as the Gihae Eastern Expedition, Gihae of the Chinese sexagenary cycle in this case referring to 1419) was the 1419 invasion of Japan, Tsushima Island led by the Joseon Dynasty.
the end of the Goryeo Dynasty to the beginning of the Joseon, the coastal regions of Korea were often the subject of Wokou raids. The Joseon Dynasty ordered a strengthening of Korean naval defenses, a strategic response to the constant threat posed by the pirates.
Joseon subsequently asked the Ashikaga Shogunate and its deputy in Kyushu to suppress the activity of the pirates, favoring legitimate traders.
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Encyclopedia
The Oei Invasion (known in Korea as the Gihae Eastern Expedition, Gihae of the Chinese sexagenary cycle in this case referring to 1419) was the 1419 invasion of Japan, Tsushima Island led by the Joseon Dynasty.
Background
From the end of the Goryeo Dynasty to the beginning of the Joseon, the coastal regions of Korea were often the subject of Wokou raids. The Joseon Dynasty ordered a strengthening of Korean naval defenses, a strategic response to the constant threat posed by the pirates.
Joseon subsequently asked the Ashikaga Shogunate and its deputy in Kyushu to suppress the activity of the pirates, favoring legitimate traders. In exchange for certain privileges, it gave authority to So Sadashige (the de facto ruler of Tsushima Province) over ships sailing from Japan to Korea. So Sadashige died in 1418, but power was seized from Sadashige's infant son Sadamori (Tsutsukumaru) by Soda Saemontaro, a powerful pirate leader. Suffering from famine, pirates on Tsushima invaded Ming China in 1419. On the way to China, they raided Korea's Chungcheong and Hwanghae provinces after their requests for food were dismissed.
After receiving reports of these incidents, the Korean court proposed an invasion of Tsushima. Taejong, who had abdicated his throne in 1418 but was still a military adviser, favored a more offensive approach. On June 9, 1419, Taejong declared a war against Tsushima, citing that it belonged to Joseon, and Yi Jong-mu was chosen to conduct the invasion.
The Conquest
Yi Jong-mu's fleet of 227 ships and 17,285 soldiers set off from Geoje Island toward Tsushima on June 19, 1419. The following day the fleet landed in Aso Bay. General Yi Jong-mu first sent captured Japanese pirates as emissaries to ask for surrender. When he received no reply, he first sent out expeditionary forces, and the soldiers proceeded to kill the islanders and pirates, plunder ships, and destroy crops. He found and rescued 131 Chinese captives of the pirates and 21 slaves on the island (mostly coastal residents and merchants abducted by the pirates). General Yi Jong-mu also found 129 ships; he burnt 109 and captured 20 of the best ships. There were several skirmishes with insurgents, and he captured 600 prisoners and killed 200 civilians. On the 26th day, however, the Korean army was ambushed on land by a Japanese army (which was mistaken for pirates) in an ambush at Nii, and suffered 150 casualties. The ambush was known to the locals as the “Battle of Nukadake”.
Sadamori called for a cease-fire, concerned about storms that frequently hit Tsushima in July and the remaining Korean forces. On his proposal, the Korean fleet retreated from Tsushima and returned to Geoje Island on the 3rd day of the 7th month.
=Aftermath=
A treaty was negotiated between Joseon and the So clan after the So clan surrendered on September 29, 1419. The Joseon government agreed to grant the So clan limited trading privileges and access to three coastal Korean ports, under the condition that the So clan control and stop any coastal pirate raids. On the 6th day of the 7th month in 1422, an emissary from the So clan requested freedom for Japanese prisoners of war captured by the Korean forces. He offered tributes of copper and sulfur in return. On the 20th day of 12th month in 1422, all Japanese prisoners of war were released.
The Treaty of Gyehae was signed in 1443. The Joseon government granted the So clan monopolistic rights on trade with Korea, in exchange for sending tribute to Seoul.
Trade relations almost got severed in 1510, when some merchants from the island rioted in the ports. A more restrictive treaty was re-imposed in 1512. The Korean export included rice, lacquerware, hemp, and Confucian texts. In exchange, the So clan provided copper, tin, sulfur, medicinal herbs, and spices from both Tsushima island and Japan. The So clan became a trading hub between Korea and Japan and benefited greatly from it.
The relationship between Korea and residents of Tsushima Island greatly improved thereafter; there were numerous records of hospitality towards shipwrecked Korean sailors who ended up on the island, and merchants from Tsushima Island enjoyed special privileges in Korean ports.
Aftermath according to Japanese sources
In Kyoto, rumors of the invasion spread around the end of the 6th month. The raid was associated with the Mongol Invasions of Japan. On the 7th of the 8th month, Shoni Mitsusada, the overlord of the So clan, reported to the Ashikaga Shogunate that the Shoni's deputy So Uemon had defeated Korean invaders. However, Korean captives were reported to have stated that the Ming was planning to invade Japan. Since Shogun Ashikaga Yoshimochi took a harder stance toward the Ming than his father Yoshimitsu, the threat was taken seriously by the shogunate. Later, the shogun received a report from the Kyushu Deputy. Since it was considerably different from the Shoni's version, the shogun felt the necessity of examining Korea's real intentions.
In a letter to So Sadamori issued on the 15th of the 7th month, the Joseon claimed that Tsushima belonged to Gyeongsang Province and asked him to leave the island, either by coming to the Korean Peninsula or by retreating to mainland Japan. In the 9th month, a man who claimed to be an envoy of So Sadamori arrived in Korea. The conditions he presented seemed unsatisfactory to the Joseon. Taejong made similar demands of the envoy in the 10th month. According to the article on the 10th day of the first leap month of 1420 of Sejong Sillok, the same self-claimed envoy verbally agreed to Korea's proposal to put Tsushima under the rule of Gyeongsang Province. On the 23rd of that month, the Korean court approved of this agreement. However, in later negotiations it was revealed that the envoy was not actually a representative of So Sadamori.
In the 11th month of 1419, envoys of Ashikaga Yoshimochi visited Korea. In return, King Sejong sent Song Gik-yeong to Japan on the 15th day of the first leap month of 1420. He left Busan on the 15th day of the 2nd month. On the 21st he met Soda Saemontaro on Tsushima as So Sadamori stayed with the Shoni clan in Hizen Province. He arrived in Kyoto in the 4th month. Having accomplished his mission, he left Kyoto in the 6th month, returning to Korea after completing negotiations with the Shoni and So clans in Kyushu. He arrived in the capital in the 10th month, 1420.
This trip corrected mutual misunderstandings between Japan and Korea. In Tsushima, Song received a protest from Soda Saemontaro over a Korean document that stated Tsushima's dependence on Korea. He warned of the Shoni clan's possible military action. Song realized that So Sadamori had not been involved in the previous negotiations, and also learned of the So clan's vassalage to the Shoni clan. These realizations overturned Korea's plans towards Tsushima. In Kyoto, Song clarified that the Joseon had no intention of invading Japan by order of the Ming. On their way back, Korean envoys faced the So and Shoni's hard-line attitude toward the Joseon.
In the 4th month of 1421, a letter under the name of So Sadamori demanded the return of Japanese captives and pointed out the groundlessness of Korea's claim over Tsushima. It is noted that the Japanese envoy took advantage of the shogunate's authority, which can frequently be found in the So clan's later diplomatic talks with Korea. By the order of Taejong, Korea took a tough stance against the So clan. Although Soda's messengers visited Korea several times, they did not reach a settlement until 1423. The death of the hard-line Taejong in the 5th month of 1422 softened Korea's policy toward Japan. Under Sejong, Joseon gave up Tsushima and decided to grant trade privileges to the So clan in exchange for its duty to maintain trade order.
Aftermath according to Korean sources
In 1419, King Sejong, under the advice of previous leader Taejong, decided to attack the enemy at Tsushima while the pirates were engaged in conflict with China. In the May of 1419, notice of this plan was sent as an ultimatum to the Tsushima province authorities. In the war declaration against Tsushima government, the King claimed Tsushima, known as Daemado in Korean, had degraded due to the lack of interference on pirate activities by the local authority. Korea repeated necessary involvement in the island's operations, by aiding in the recent famine and general trade route policing led the ruler to declare the land would be reclaimed by force in order to protect the integrity of the region.
During the invasion, 180 Korean soldiers were killed. Another source recorded that about 100 Korean soldiers were killed and about 20 Japanese soldiers were killed. The Korea army discovered the Chinese. However, they know the defeat of the Korea in detail. Then a Korean cabinet official claimed that we cannot return them to China. 110 Japanese were captured, and another 700 were killed in combat. The Korean invaders were able to send 140 abducted Chinese back to their homeland after releasing them from pirate captivity.
In the July of 1419, King Taejo sent a letter to Tsushima's Sadamori laying claim to the historical repossession of Daemado (Tsushima) due to the Korean victory in war. Once again the land was Korean territory as it had been under the Kingdom of Shilla. An arrangement was proposed for Tsushima to become a tribute relationship. In the 9th month of 1419 Sadamori sent an emissary to surrender the territory and to present a variety of tribute to the Korean court. In the January of 1420, a Japanese envoy visiting Seoul requested to have a copy of Tripitaka Koreana, a comprehensive Buddhist script held in great regard as a Korean national treasure. King Sejong granted the request as sign of friendship between two countries. In the 1st leap month of 1420 Sadamori requested that the island officially become a state of Korea under the name of Daemado, also promising to personally become a subject and to manage the Wokou situation as an independent act of the state. King Sejong granted this request as well as allowing Sadamori to report to Gyeongsang province rather than Seoul.
See also
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