The Battle of Busan of 1592 (or more accurately, the Battle of Busanpo or Battle of Busan Bay) was a naval bombardment of anchored Japanese ships at Busan. Yi Sun-sin managed to destroy over 100 Japanese ships and retreated with minimal casualties. It was a naval engagement that took place on 1 September 1592 during the first phase of the Japanese invasions of Korea. It was a Korean surprise attack on the fleet of Toyotomi Hideyoshi stationed at Busan, and its main objective was to recapture Busan, which would thoroughly cutoff the supply line of the Japanese army. In this battle, officer Jung Un and six soldiers died, the Japanese lost over 100 ships, and the Japanese military lost control of the seas around the Joseon.

Battle of Busan (1592) - Wikipedia