arranged location where Won Gyun was supposed to meet them, and met Yi Sun-sin on July 23. The augmented flotilla of 91 ships then began circumnavigating Geoje Island, bound for Gadeok Island, but scouting vessels detected 50 Japanese vessels at Okpo harbor . Upon sighting the approaching Korean fleet, some of the Japanese who had been busying themselves with plundering got back to their ships, and began to flee. At this, the Korean fleet encircled the Japanese ships and finished them with artillery bombardments. The Japanese fired with their arrows and arquebuses, but the Koreans kept a good distance from them, rendering the Japanese fire ineffective. A teenage Korean girl, taken by the Japanese to be used as a sex slave on board one of their ships recalled: The Koreans spotted five more Japanese vessels that night, and destroyed four. After one day's fighting, Yi Sun-sin's fleet had destroyed 26 Japanese ships. The next day, the Koreans approached 13 Japanese ships at Jeokjinpo. In the same manner as the previous success at Okpo, the Korean fleet destroyed 11 Japanese ships – completing the Battle of Okpo without the loss of a single ship. In his report to King Seonjo about his victory, Admiral Yi Sun-sin found the samurai helmets of the Japanese to be rather strange, writing: The Japanese generals were shocked to hear of the Battle of Okpo, where the Koreans had not lost a single ship, as it threatened to cut them off from Japan. After his victory, Yi Sun-sin found the burnt out remains of countless coastal villages, where the Japanese had enslaved the women while killing all the men. About three weeks after the Battle of Okpo, Yi Sun-sin and Won Gyun sailed with a total of 26 ships (23 under Yi Sun-sin) toward the Bay of Sacheon after receiving an intelligence report of the Japanese presence. Yi Sun-sin had left behind his fishing vessels that made up most of his fleet in favor of his newly-completed turtle ship. At Sacheon, the Japanese ships were anchored in the bay below a promontory where the Japanese had set up a command base. A turtle ship is a vessel of a panokseon design with the removal of the elevated command post, the modification of the gunwales into curved walls, and the addition of a roof covered in iron spikes (and possibly hexagonal iron plates; this is disputed). Its