Was the "turtle ship" really the world's first armored battleship? Admiral Yi Sun-shin is revered in Korean history for his heroic actions in rescuing his country from near ruin during the Hideyoshi Invasions, a two-part international war that began with an attack by Japan in 1592 and lasted for seven years until a combined maneuver by the Joseon and Ming dynasties defeated the Japanese. Yi adapted the existing "turtle boat" format by placing an iron plate over it and supplementing several other