Turtle ship
The turtle ship or retreated ship is the ship of the Joseon Dynasty. The turtle ship is a ship based on the Ponok Line, covered with a lid on the entire surface of the deck of the Ponok Line, and covered with wooden boards. And on this wooden board, there were innumerable awls and swords, so that the enemy could not jump. The athlete rescued the head of the turtle, shot the canvas from there to the front, set the tail of the turtle on the stern, and shot the canvas. Eventually, the turtle ship was able to fire six cannons in front and behind and on the side of the hull side, respectively, in a safe place, with the guns guarding the crew. Commander Yi Soon Shin of the naval forces of the Joseon Dynasty built on the eve of Imjinwaeran and was the first to appear in the Battle of Sichuan during the Japanese invasion of Japan. The records of the Chosun dynasty annals include the turtles as Chinese characters. After the Japanese invasion of Japan, it is said that the Japanese were called Bokkai Sen, which resembled Shachihoko. In 1597, July 16, the lunar month of the 7th lunar battle, all of them were sunk by Japanese troops.