Chung Mu is the given name of great Admiral Yi Sun-Sin who was in charge of naval operations during the Joseon Dynasty. He was given the posthumous title, Lord of Loyalty and Chivalry (Chungmu-gong, 충무공; 忠武公).
Born in 1545, Yi Sun-Sin was considered a master naval tactician and was largely responsible for the defeat of the Japanese in 1592 and 1598. He has been compared to Sir Francis Drake and Lord Nelson of England. His name is held in such high esteem that when the Japanese fleet defeated the Russian navy in 1905, the Japanese admiral was quoted as saying, "You may wish to compare me with Lord Nelson but do not compare me with Korea's Admiral Yi Sun-Sin.... He is too remarkable for anyone."
Yi Sun-Sin's most famous invention was the Kobukson, or turtle-boat, a galley ship decked over with iron plates to protect the soldiers and rowing seamen. It was so named because the curvature of the iron plates covering the top decks resembled a turtle's shell. The ship was 110 feet long and 28 feet wide with a lower deck for cabins and supplies, a middle deck for oarsmen, and an upper deck for marines and cannons. Most of the timber was four inches thick, giving the ship protection from arrows and musket balls. It had a large iron ram in the shape of a turtle's head with an open mouth from which smoke, arrows, and missiles were discharged. Another such opening in the rear and six more on either side were for the same purpose. The armored shell was fitted with iron spikes and knives that were covered over with straw or grass to impale unwanted boarders.
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