Editing Turtle ship (section)

==Armament==
{{main|Korean cannon}}[[File:Chongtongs-Jinju Castle.jpg|thumb|Three large [[Chongtong]] at the Jinju Fortress museum. The closest is a ''cheonja-chongtong'', the second is a ''jija-chongtong'', and the third is a ''hyeonja-chongtong''.]]The turtle ship was equipped with ''cheonja'' "heaven", ''jija'' "earth", ''hyeonja'' "black", and ''hwangja'' "yellow" type [[chongtong]] (Joseon cannons). There was also an [[arquebus]] known as ''seungja'' (victory). The ''seungja'' ranged {{convert|200|m}} while the ''hwangja'' was the lightest but with a range of {{convert|1200|m}}. According to Hae-Ill Bak, one Japanese record of the Battle of Angolpo records the experience of two Japanese commanders on July 9, 1592, in their battle against turtle ships: "their (turtle ships') attack continued until about 6 o'clock in the afternoon by firing large fire-arrows through repeated alternate approaches, even as close as 18–30 feet. As a result, almost every part of our ships—the turret, the passages and the side shielding—were totally destroyed..."<ref name="Bak" />

A dragon's head was placed on the top of the ship at the bow. Several different versions of the dragon's head were used on the turtle ships. The dragon's head was first placed as an early form of psychological warfare in order to scare Japanese soldiers. One version carried a projector that could release a dense toxic smoke that was generated to obscure vision and interfere with the Japanese ability to maneuver and coordinate properly.{{sfnp|Needham|1971|pp=683–684}}