In 1419, King Sejong, under the advice of his father and former king Taejong, decided to attack the enemy at Tsushima while the pirates were engaged in conflict with China. In the May 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.