Construction
According to the Nanjung Ilgi, Yi's wartime diary, Yi decided to resurrect the turtle ship in 1591, from pre-existing designs (see picture, illustrated nearly 200 years earlier), after discussing the matter with his subordinates. Once concluding that a Japanese invasion was possible, if not imminent, Yi and his subordinate officers, among whom Na Dae-yong (羅大用) is named as the chief constructor, constructed the first modern turtle ship. Yi's diary, along with the book entitled Hangrok written by his nephew Yi Beon, described numerous important details about the structures, construction progress, and the use of turtle ships in battle, as well as the testing of weaponry used in the ships.
The mounted weapons, Korean cannons with ranges from about 300 to 500 metres, were tested on March 12, 1592. Yi completed his first turtle ship and launched it on March 27, 1592, one day before the Siege of Busan and the Battle of Tadaejin.
Read more about this topic: Turtle Ship
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