Won Gyun

Japan had just united after a long period of internal warfare by a new leader, Toyotomi Hideyoshi, who had become supreme ruler over most of Japan by killing many rivals to rise to power. He decided to begin an expansionist war against Japan's neighbors. Some Koreans realized that the threat from Japan was great and argued that the Joseon dynasty needed to prepare for invasion from Japan as well as the existing Jurchen menace. However, the government was divided along factional lines, and officials could not reach a decision. Hideyoshi saw the chance to take Korea unprepared.

On April 13, 1592, the Japanese fleet,.under Katō Kiyomasa, launched a sudden strike on the Eastern Fleet of Gyeongsang province and disabled every ship under its control. The main army under Kato and Konishi Yukinaga landed on the Korean Peninsula the next day and marched northward. Won, the commander of the Eastern Fleet of Gyeongsang Province, was also routed by the invading Japanese. (Won's predecessor was able to pass a fleet combat readiness inspection just one year before the war.) With the able force, Admiral Won may have had an opportunity to intercept and engage Japanese invading forces at sea, thus perhaps preventing or delaying the Japanese incursion on Korean soil. However, he decided not to act upon the naval intelligence regarding the Japanese incursion until the Japanese landing party had established a beachhead and successfully laid siege upon the city of Busan.

At that point, Won sank many of his ships in retreat to ensure they would not be captured by invading Japanese forces. With four ships left under his command, Won called for help from Yi Sun-sin, who had prepared for war and raised a smaller and battle ready fleet. King Seonjo finally ordered both admirals to fight against the Japanese forces on May 2, 1592. Won and Yi began their campaign two days later, with Admiral Yi Eok Ki, the commander of the Eastern Fleet of Jeolla Province who later became the commander of the Western Fleet of the same Province following Yi's promotion.

On May 7, the Korean navy under Yi destroyed a Japanese fleet in the Battle of Okpo. Later, Won was promoted to an army general, and Yi became naval chief of staff.

In 1597, Japanese decided to stop all negotiations with the Koreans and Chinese Ming Dynasty and planned a re-invasion of Korea. To do so, they plotted to remove Admiral Yi Sun-sin from his position. Japanese spies directed by Konishi Yukinaga spread word that Katō Kiyomasa was urging other Japanese to continue fighting and would soon be crossing the sea. King Seonjo ordered Admiral Yi to capture Kato, but Yi refused to do so, as he knew that the words were the fabrications of Japanese agents.

Seonjo was in fear of a possible coup d'état attempt by Yi or by his supporters, which was never plotted, but Seonjo convinced himself it could happen any day: Yi refused to carry out his orders several times and his fleet was the strongest combat force on both sides. Yi refused to carry out the orders purely due to tactical reasons, but the act of insubordination itself, no matter how justifiable, frightened the King beyond his breaking point. King Seonjo finally ordered the execution of Yi, but the royal court reluctantly yet successfully resisted the order and was able to lower the punishment to imprisonment and demotion. Yi was placed under the command of Gwon Yul to recover from his wounds from the torture administered during the investigation of the charges against him. Seonjo then replaced Yi with Won Gyun as the naval chief of staff.

Won also knew the information was false and did not advance toward Busan for the same tactical reasons Yi reported to the royal court before his removal from the post. Yi was removed for refusing orders to engage the Japanese. The government continued to trust the information and ordered Won to attack Japanese ships at Ungchŏn. Won attacked the Japanese — who were mostly unarmed and protected under the cease-fire treaty to support the negotiation process which was about to be terminated — and defeated them. He lost one of his battleships and its captain during the attack. He did not advance after receiving a letter of protest from the Japanese commander. Then Field Marshal Gwon Yul, who was also under heavy pressure from the king, recalled Won to his headquarters and once again ordered him to attack Busan. Won finally led the navy towards Busan, along with the famous admiral Yi Eok Ki, following orders despite tactical considerations.

The Japanese at first seemed to retreat, but it was a trap. The Japanese were prepared to devastate the Joseon navy before land invasion. The number of Japanese ships was so great that most Koreans were already frightened, including Admiral Bae Seol. The Japanese fleet, commanded by Todo Takatora, advanced toward Won Gyun's fleets. Won knew that he would lose the battle but had no choice but to engage.

At the Battle of Chilchonryang, most of Joseon Navy's ships were destroyed. Won was considered to be killed in action while running away, when his brother was killed during this battle. Only the small detachment of twelve warships under the command of admiral Bae Sŏl — who refused to participate and fled even before the battle began — survived. Every other ship in the combat was destroyed or disabled, along with almost all of Joseon navy line officers and many capable mid-level commanders.

• Portrayed by Choi Jae-sung in the 2004-2005 KBS1 TV series Immortal Admiral Yi Sun-sin.[2][3][4]

• In Yi Soon Shin: Warrior and Defender, as one of Yi's adversaries.

In the Admiral Yi campaign of the video game Empires: Dawn of the Modern World, Won Gyun is portrayed as a traitor to Korea, allying first with Manchu raiders harassing Korea's north and later with the Japanese invaders. In this portrayal, Won Gyun appears to be responsible for masterminding both attacks on Korea, with the eventual aim of becoming King of a reduced Korea, allied to Japan and tributary to Ming China. His treachery is discovered by Ryu Seong-ryong, and he is arrested.