While Yi found success at sea, the Korean land army suffered terrible losses. Yi Il, the man who once accused Yi of negligence, lost one battle after another, until finally the regular forces were annhilated at Chungju. The Joseon court that ruled to Korea fled to Pyongyang, on the verge of being pushed out of their own country. But that same day, Admiral Yi tore through a Japanese fleet at Okpo. He moved on to Sacheon, where he baited the Japanese commander into a trap and debuted his turtle ship. The unstoppable turtle ship carried the day, so he used this tactic again and again he destroyed a Japanese fleet while suffering no losses of his own. Finally, Hideyoshi ordered his naval commanders to take Jeolla, Yi's headquarters. Sadly for him, his general Wakisaka Yasaharu grew too eager and engaged Yi without backup at Gyeonnaeryang Strait, only to find himself lured into an even more sophisticated version of Yi's bait-and-retreat strategy: a "Crane's Wing" of ships that collapsed on the overextended target from all sides. In one of the largest naval battles in history, Yi scored a decisive win and again didn't lose a single ship. He headed to Angolpo to attack Hideyoshi's two remaining generals and seal his victory, but they refused to be baited. He had to settle for a long range exchange of cannon fire, which worked at the cost of many injuries to his own men. In the end, he destroyed all but a few Japanese ships, and those he only spared to give the Japanese some means to escape and stop raiding in Korea. But he had accomplished his goal: Hideyoshi ordered a halt to all naval operations except guarding Busan, and without this control of the sea, Japan could not re-supply their troops nor hope to resume the assault that would have finally pushed Korea's leaders out of Korea.