In August of 1592, 100,000 Japanese troop reinforcements headed around Pyongyang peninsula and up the west coast. Admiral Yi and his Lieutenant Yi Ok-Keui confronted them at Kyon-Na-Rang among the islands off the southern coast of Korea. Pretending at first to flee, Admiral Yi then turned and began to ram the Japanese ships. His fleet followed his lead and sank 71 Japanese boats. When a Japanese reinforcement fleet arrived, Admiral Yi's fleet sank 48 more Japanese ships and forced many more to be beached as the Japanese sailors tried to escape on land. This engagement is considered to be one of history's greatest naval battles.
Unaware of this battle, the Japanese commander had sent a message to the Korean King Son-Jo that read: "100,000 men are coming to reinforce me. Where will you flee then?" Upon hearing that Admiral Yi had shattered the Japanese fleet, the king was elated and heaped all possible honors upon him. For the Japanese, any hope of an invasion of China was now totally crushed.
Admiral Yi Sun-Sin pushed on to Tang-Hang Harbor where he encountered another large Japanese fleet that included the huge Japanese flagship of the Japanese admiral. Admiral Yi ordered his best archer to shoot the Japanese admiral, who sat on the deck dressed in silk and gold. The arrow pierced the Japanese admiral's throat, throwing the entire Japanese fleet into a panicked retreat which ended in carnage as Yi pursued in his usual fashion.