walls contained a total of 36 cannon ports, and also openings above the cannon, through which the ship's crew members could look out and fire their personal arms. The design prevented enemies from boarding the ship and aiming at the personnel inside. The ship was the fastest and most maneuverable warship in the East Asian theater, powered by two sails and 80 oarsmen taking turns on the ship's 16 oars. No more than six turtle ships served throughout the entire war, and their primary role was to cut deep into the enemy lines, cause havoc with their cannons, and destroy the enemy flagship. On July 8, 1592, the fleet arrived at the Bay of Sacheon, where the outgoing tide prevented the Korean fleet from entering. Therefore, Yi Sun-sin ordered the fleet to feign withdrawal, which the Japanese commander, Wakisaka Yasuharu, observed from his tent on a rock. The Japanese decided to give chase, embarked their 12 ships, and pursued the Korean fleet. The Korean navy counterattacked, with the turtle ship in the front, and successfully destroyed all 12 ships.Turnbull, 2008 p. 33. In his report to King Seonjo, Admiral Yi wrote: "Previously, foreseeing the Japanese invasion, I had a turtle ship made...with a dragon's head, from whose mouth we could fire cannons, and with iron spikes on its back to pierce the enemy's feet when they tried to board. Because it is in the shape of a turtle, our men can look out from inside, but the enemy cannot look in from outside. It moves so swiftly that it can plunge into the midst of even many hundreds of enemy vessel in any weather to attack them with cannonballs and fire throwers". The Japanese followed their code of Bushido by fighting ferociously, but the superior firepower and armor of the turtle ships more than compensated. Admiral Yi commanded from his deck, and was badly wounded when a Japanese sniper put a bullet into his shoulder. At the Battle of Dangpo, fought by Miruk Island, 21 Japanese ships commanded by Kurushima Michiyuki were in the process of sacking a Korean seaside village, when the Korean fleet appeared to offer a challenge. Yi Sun-sin once again followed his usual tactic of coming forward to challenge, then making a feigned retreat with the Japanese in hot pursuit before ambushing them on the open sea. A Korean girl who had been taken prisoner and