Complete the sentence about Republic of Korea Navy with the correct year: In ______, naval forces of the Goryeo dynasty defeated 500 invading Japanese pirate vessels by deploying shipboard guns, devised by Ch'oe Mu-sŏn.

Answer and explanation

Correct answer: B. 1380

In 1380 Goryeo naval forces defeated 500 invading Japanese pirate ships using shipboard guns devised by Choe Museon. It is reportedly the first use of shipboard guns in naval history.

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