1419. On the way to China, they invaded Korea's Bi-in and Haeju counties after their demands for food were rejected. After receiving reports of these incidents, the Korean court approved an expedition of Tsushima. King Taejong, who had abdicated his throne in 1418 but was still a military adviser of Sejong the Great, favored a more offensive approach. On June 9, 1419, Taejong declared a war against Tsushima, citing that it belonged to Joseon, and Yi Jongmu was chosen to conduct the expedition. Invasion The Koreans waited until a large Japanese fleet had left the island for a raid. 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 Asō Bay (浅茅湾). General Yi Jong-mu first sent captured Japanese pirates as emissaries to ask for surrender. When he received no reply, he sent out expeditionary forces, and the soldiers proceeded to raid the islanders and pirates and plunder pirate settlements. According to "Veritable Records of the Joseon Dynasty" a Korean history book, in the battle of June 20, the Korean army captured 129 wokou ships, burned 1939 houses, killed 114 people, captured 21 people, and rescued 131 Chinese who were captured by the wokou. On June 29, the Joseon expeditionary forces "set fire to sixty-eight houses belonging to the pirates, burned fifteen vessels belonging to the pirates, beheaded nine pirates, and obtained fifteen Chinese men and women and eight Joseon people [who had been held in captivity]." In the record of July 10, the number of soldiers killed by wokou was rectified to 180. According to the Taishuu Chronenryaku, which was a Japanese source compiled later, the death toll of the Korean army was 2500. In the weeks that followed, a truce was negotiated with the Sō clan on the island. The Korean expeditionary force withdrew and sailed back to the Korean Peninsula on July 3, 1419. In subsequent diplomatic exchanges, Tsushima would be granted trading privileges with Joseon, in exchange for maintaining control and order of pirate threats originating from the island. Aftermath The activities of wokou declined after this invasion. 24 years later in 1443 the Treaty of Gyehae would be negotiated between Joseon and the Sō clan in which the Joseon government agreed to grant the Sō clan limited trading privileges and access to three coastal Korean ports, under the