bureaucratize and administrate the province, and allowed several garrisons to be handled by the Koreans themselves. Naval campaigns of 1592 Having secured Pyongyang, the Japanese planned to cross the Yalu River into Jurchen territory, and use the waters west of the Korean peninsula to supply the invasion. However, Yi Sun-sin, who held the post of the Left Naval Commander of the Jeolla Province (which covers the western waters of Korea), successfully destroyed the Japanese ships transporting troops and supplies. Japan, lacking enough arms and troops to carry on the invasion of China, changed the objective of the war to the occupation of Korea. When the Japanese troops landed at the port of Busan, Bak (also spelled Park) Hong, the Left Naval Commander of the Gyeongsang Province, destroyed his entire fleet, his base, and all armaments and provisions, and fled. Won Gyun, the Right Naval Commander, also destroyed and abandoned his own base, and fled to Konyang with only four ships. Thus there was no Korean naval activity around the Gyeongsang Province, and the surviving two, out of the four total fleets, were active only on the other (west) side of the peninsula. Won Gyun later sent a message to Yi Sun-sin that he had fled to Konyang after being overwhelmed by the Japanese in a fight. A messenger was sent by Yi Sun-sin to the nearby island of Namhae Island to give Yi's order for war preparations, only to find it pillaged and abandoned by its own inhabitants. As soldiers began to flee secretly, Yi Sun-sin gave an order "to arrest the escapees" and had two of the fugitives brought back and beheaded; he then had their heads put out for display. Yi Sun-sin's battles steadily affected the war and put significant strain on the sea lanes along the western Korean Peninsula supporting the Japanese advance. The Korean navy relied on a network of local fishermen and scouting boats to receive intelligence of the enemy movements. On the dawn of July 21, 1592, Yi Sun-sin and Yi Eok-gi set sail with 24 panokseons, 15 small warships, and 46 boats (i.e. fishing boats), and arrived at the waters of Gyeongsang Province by sunset. The Japanese had been sailing up and down the Korean coast, looting and burning all of the seaside villages, and did not expect opposition from the Korean navy. The next day, the Jeolla Province fleet sailed to the