20 Won Turtle Boat

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Turtle ship

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1592
92 (2003)

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Plain

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The Battle of Sacheon was the first battle during which Admiral Yi deployed the turtle ship. By the time the Koreans and the Japanese were out on the open sea, it was nearly dark. Nonetheless, Admiral Yi had the turtle ship and his other vessels turn around quickly and fire upon the Japanese. Admiral Yi had his men unleash a hail of cannonballs and fire arrows. This had an immediate effect on the enemy warships, and the Japanese ships started taking heavy damage.
The fierce and sudden Korean attack shocked the Japanese. But unlike their previous poor performance at the Battle of Okpo, the Japanese soldiers fought bravely and returned fire with their arquebuses in a timely manner. Unfortunately for the Japanese, they did not have a chance to board the Korean ships because of concentrated Korean cannon fire. Also, the Turtle Ship was impossible to board anyway due to iron spikes on its roof. Then, the Japanese began to panic when the Turtle Ship smashed into Japanese lines, firing in every direction.
https://en.wikipedia.org/wiki/Battle_of_Sacheon_(1592)#The_Turtle_Ship

Interesting fact