Won Gyun
Won Gyun was an incompetent naval commander who immediately began squandering the Joseon navy's strength through ill-conceived maneuvers against the Japanese naval base at Busan. In the Battle of Chilchonryang, the Japanese navy, with Tōdō Takatora in overall command, outmaneuvered the Joseon navy and virtually wiped it out. Soon afterwards, the Japanese reinforced their garrisons in Busan and various forts on the southern coast of Korea, and began the second invasion.