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 cannon, 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. The Korean attack was led by a turtle ship. In his report to King Sonjo, 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 Tanpo'o, fought by Miruk island, 21 Japanese ships commanded by Kurushima Michiyuki were in the process of sacking a Korean sea-side village, when the Korean fleet appeared to offer a challenge. Yi once 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 taken prisoner and forced to become Kurushima's mistress in an interview after the battle said: "On the day of the battle, arrows and bullets rained on the pavilion vessel where he [Kurushima] sat. First he was hit on the brow but was unshaken, but when an arrow pierced his chest he fell down with a loud cry", while the turtle ship "dashed close to this pavilion vessel and broke it by shooting cannonballs from the dragon's mouth and by pouring down arrows and cannonballs from other cannon".