Japanese invaders in Korea notified Toyotomi Hideyoshi, held the real power in Japan, of the defeats in the seven battles in the southern coasts of Korea. Japanese invaders which exterminated Korean army in the land needed more safe supplies through the sea to continue the invasion to the border line of China. For the supplies to the army, they needed to advance to the western coasts through the southern. The sea road, however, was blocked by the union fleets in Yosu.
Toyotomi ordered specially to his army and navy to destroy the union fleets. 협판안치, the commander who stayed in Yongin, near Seoul, was transferred to Ungcheon, near Yosu, to rebuild the frustrated Japanese fleets. Additionally, 구괴가륭 and 가등가명, Toyotomi's top officers, were dispatched to Korea from Japan with more fleets. Their goal was to eliminate Lee's fleets from southern coasts.
Since June, 10 or 30 Japanese fleets moved very often near the Kerje Island to demonstrate their power. Won reported to Lee to ask new movements. Lee made the third movement from July 5th to the July 13th with Ukee Lee, the commander of Cholla Right Navy. In this movement, Lee accomplished the greatest triumphs in the war history in the world in Hansan Battle. Lee beat 59 Japanese war ships in Hansan Island and 30 in Angolpo. Lee smashed the last dream of Toyotomi to take the command of the South Sea of Korea. After the third movement, Toyotomi notified the Japanese navy not to advance to the western coasts of Pusan.
1) The Hansan Battle (July 8th)
The union fleets, left from Yosu on 5 July, arrived in Kyunnaeryang, on 8 July, where the Japanese ships often moved. There, the hugh Japanese fleets were busy to prepare the sea battles. At that time, the union fleets had 56 war ships (24 from CLF, 25 from CRF, 7 from Won who was the commander of Kyungsang Right Navy). Kyunnaeryang is the small channel between Kerje Island and the Peninsula Tongyoung, the channel whose length is 4 kilometers and width 600 meters. Lee thought this channel was not good enough for the sea battle due to its small topography and the reefs. Moreover, in his experiences in the sea battles he had near the land, the invaders used to run away abandoning the ships. He wanted to exterminate the soldiers as well as the ships.
[The map of the third movement]
The union fleets approached to the Japanese navy to pretend to fight. And then, they suddenly turned the ships to run away. Japanese were after the union fleets with hostility to Hansan Island. They already moved far from the land. Lee thought it was time to have a battle and the invaders would be isolated though they ran away to Hansan Island giving up the ships because Hansan is a just small island. With Lee's sign, the union fleets changed the flags to the blue with dragon marks. Suddenly, the ships of the right and left sides of the union running after the Japanese turned the ships and surrounded them as the cranes unfold their wings. It was "crane wing disposition" which Lee deviced for the sea battles. Japanese faced the attacks from the three directions, from the front side and from the right and left wings. Also, the turtle ships just penetrated the center of the Japanese fleets. It was a very fierce battle. Japanese lost the control and ran away to Hansan Island. 59 of 73 Japanese ships were sank and the invaders who lost the ships were drowned or terminated in Hansan Island. The Hansan Battle changed the peak of the war and the invaders began to lose the power in Korea. Dr. Hulbert, an American historian, described this battle in his writing, Modern History of Japan. He mentioned that The Hansan Battle sentenced to death to the invasion of Toyotomi. 2) The Angolpo Battle (July 10th)
After the Hansan Battle, the union took the rest for a day and moved to Angolpo on 10 July to exterminate the remain Japanese ships. Near Angolpo, Lee made a strategy. He ordered CRF to charge Karduk, outside of Angolpo to guard the back side against the Japanese reinforcements from Pusan. Lee commanded CLF to attack Angolpo port with Won's fleets. In Angolpo, 42 Japanese ships were at anker and most of the invaders already landed and set the disposition for the battle. Lee checked the bay and decided to induce the ships out of the bay because it was not deep enough and too small to fight. But the invaders did not follow the Lee's idea. They had a painful experience in Hansan. Lee, not able to find a good way to take them out, bunt just 30 ships and retreated from there.