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 condition that the Sō clan control and stop any coastal pirate raids. After the conclusion of this treaty the activities of wokou were further suppressed. The number of trade ships from Tsushima to Korea was decided by this treaty (50 ships a year), and the Sō clan monopolized the trade with Korea.