What were turtle ships, and what role did they play in Korean history

Developed and deployed by Korea's brilliant admiral, Yi Sun-sin, the Turtle Ship (known among the Koreans as Geobukseon) was a coastal defense galley; but one possessed of some unique features. First, it was a ship whose sides and deck were covered-over; to protect the crew from missile bombardment.

Explanation:

its c not d   tell me if that´s correct

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it's lit.