Panokseon ("board roofed" ship) was an oar and sail propelled ship that was the main class of warship used by Joseon during the late 16th century. The first ship of this class was constructed in 1555. It was a ship made of sturdy pine wood, and was instrumental in the victories over the numerically superior Japanese Navy during the Japanese invasions of Korea (1592–98). Admiral Yi Sun-sin (1545–98) of the Joseon navy employed them alongside turtle ships during the war with great success.