At the Battle of Hansando, the Japanese commander broke ranks and Yi routed his fleet. Yi's expertise on naval strategy is apparent in the fact that his successor, Won Gyun, even with all of Yi's ships and trained crew, could not defeat an enemy fleet of similar might. One of the greatest legacies of the admiral was the disruption of the Japanese supply line. Through his calculated attacks, he successfully burdened the Japanese navy and the supplies trying to reach their lines near the Chinese border.