Yi Sun-sin

Yi Sun-sin (1545–1598) was a legendary Joseon naval commander who remains universally celebrated as one of the greatest naval strategists in world history. Undefeated in 23 naval battles, his genius secured control of the seas during the Imjin War.

Early Career and Preparation

Born in Hanseong (Seoul), Yi Sun-sin passed the military examination in 1576 at age 32. He spent his early career facing factional opposition while proving his integrity and military skill along the northern border at Noktundo. Appointed as Left Naval Commander of Cholla Province in 1591, Yi foresaw war with Japan. He meticulously reinforced coastal defenses, built heavy Panokseon warships, and resurrected the iron-capped Turtle Ship (Geobukseon).

23 Victorious Battles and Hansando

When Japan invaded in May 1592, Yi Sun-sin immediately launched naval counteroffensives. Achieving victories at Okpo and Sacheon, he deployed the Turtle Ship in combat for the first time. At the Battle of Hansando in August 1592, Yi lured Wakizaka's main Japanese fleet into open waters and deployed the Hakikjin (Crane Wing formation), annihilating 59 Japanese warships. This decisive victory severed Japan's maritime supply lines, saving Joseon.

Myeongnyang, Noryang, and Martyrdom

Falsely accused due to Japanese counter-intelligence and court politics in 1597, Yi was imprisoned and stripped of rank, serving as a common soldier (Baek-ui Jonggun). After the destruction of the fleet at Chilcheollyang under Won Gyun, Yi was reinstated with only 13 remaining warships. At the Battle of Myeongnyang, he exploited the roaring currents of Uldolmok to destroy 31 enemy ships out of 133. Finally, at the Battle of Noryang in December 1598, Yi commanded the joint Joseon-Ming fleet to crush the retreating Japanese army. Struck by a stray bullet in the final hour, his last words were: "Do not announce my death."