Editing Turtle ship (section)

==History==
The first references to older, first-generation turtle ships, known as ''gwiseon'' ({{Korean|hangul=귀선|hanja=龜船|labels=no}}, {{IPA|ko|kɥisʌn}}), come from 1413 and 1415 records in the ''[[Annals of the Joseon Dynasty]]'', which mention a mock battle between a ''gwiseon'' and a Japanese warship. However, these early turtle ships soon fell out of use as Korea's naval preparedness decreased during a long period of relative peace.{{sfnp|Hawley|2005|p=192}}

Turtle ships participated in the war against [[Naval history of Japan|Japanese naval forces]] supporting [[Toyotomi Hideyoshi]]'s attempts to [[Japanese invasions of Korea (1592–98)|conquer Korea from 1592 to 1598]].{{sfnp|Swope|2005|p=32}} Korean Admiral [[Yi Sun-sin]], who won all battles against the Japanese Navy, is credited with designing the improved turtle ship. From their first appearance in the [[Battle of Sacheon (1592)|Battle of Sacheon]], his turtle contributed to winning 16 battles against the Japanese fleet under the command of various Daimyos primarily from Western Japan, though under the command of [[Wŏn Kyun]] the Joseon Navy suffered a devastating defeat in the [[Battle of Chilcheollyang]].{{sfnp|Needham|1971|pp=683–684}} It is unknown precisely how many of Yi's Turtle Ships were constructed.{{sfnp|Holz|2009|p=53}} The cost of one of these armored warships would have been high, especially if the deck was lined with hexagonal iron plates as some sources suggest.{{sfnp|Hawley|2005|pp=195–197}}