Yi Sun-sin
First campaign

Yi had never officially studied naval warfare in his limited time in the military academy, and neither he nor his subordinates had experience in naval combat before the Japanese invasion.

On the June 13, 1592, Admiral Yi and Admiral Yi Eok-gi (이억기; 李億祺; 1561–1597), the commander of the Right Jeolla navy, set sail with 24 panokseons, 15 small warships, and 46 boats (i.e. fishing boats), and arrived at the waters of Gyeongsang Province by sunset. The next day, the Jeolla fleet sailed to an arranged location where Admiral Won Gyun (원균; 元均; 1540–1597) was supposed to meet them, and met the admiral on June 15. The augmented flotilla of 91 ships then began circumnavigating the Geoje Island, bound for the Gadeok Island, but scouting vessels detected 50 Japanese vessels at the harbor of Okpo. Upon sighting the approaching Korean fleet, some of the Japanese who had been busying themselves with plundering returned to their ships and began to flee. The Korean fleet encircled the Japanese ships and finished them off with artillery bombardments. The Koreans spotted five more Japanese vessels that night, and managed to destroy four of them. The next day, the Koreans approached 13 Japanese ships at Jeokjinpo, as reported by their intelligence. In the same manner as the previous success at Okpo, the Korean fleet destroyed 11 Japanese ships – completing the Battle of Okpo without the loss of a single ship.
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