Eulji Mundeok

Eulji Mundeok (Ulchi Mundok) was a military leader of early 7th century Goguryeo, one of the Three Kingdoms of Korea, who successfully defended Goguryeo against Sui China. He is often numbered among the greatest heroes in the military history of Korea.

Background
Eulji Mundeok was born in the mid-6th century and died sometime after 618, although the exact date is unknown. Haedong Myeongjangjeon, known as the "Biographies of Famed Korean Generals", written in the 18th century, states that he was from Seokda Mountain near Pyongyang. At the time of his birth, Goguryeo was a powerful state, frequently at war with its neighbors.

In 589, the Sui dynasty conquered several surrounding states and launched several large military campaigns against Goguryeo, which was unwilling to submit to its dominance.

Eulji Mundeok was a cultured man, skilled in both the martial and literary arts. He eventually rose to become the supreme commander of Goguryeo. The name Eulji may actually be a Goguryeo title.

There is a theory that Eulji Mundeok was originally of Xianbei origin.

The Battle of Salsu River
After the founding of Sui in 589, a precarious peace was maintained for several years between the new Chinese dynasty and Goguryeo. However, in 597, Yeongyang launched an attack on the Sui at the Battle of Linyuguan. In response, Sui invaded Goguryeo, but the invasion was defeated due to constant ambushes and unfavorable weather.

In the early 7th century, Emperor Yang learned of a secret correspondence between Goguryeo and the Eastern Turkic Khaganate. Emperor Yang demanded Yeongyang come and submit personally to him or face an "imperial tour of his territories". When Yeongyang failed to do so, Emperor Yang prepared for war. He mustered an army of over 1,133,000 troops and more than 2 million auxiliaries and personally led them against Goguryeo in 612. The Sui army quickly overran Goguryeo's border defenses, then camped on the banks of the Liao River and prepared to bridge it.

Eulji Mundeok, commissioned as the Field Marshal, was called upon to defend the nation. He prepared his troops to meet the numerically superior Sui forces with a strategy of deception, using feigned retreats and sudden attacks. After the Sui forces crossed the Liao River, a small contingent was sent to attack the city of Yodong, but was repulsed by Eulji Mundeok's forces. As the rainy season progressed, the Sui forces launched other small probing attacks, but held off from making any large moves before the end of the rainy season.

When the rains stopped, Emperor Yang moved his forces to the banks of the Yalu River in northwestern Korea and prepared for a major battle. Fighting only small engagements at times and places of his choosing, Eulji Mundeok drew the Sui forces further and further from their supply centers. Emperor Yang sent an advance force of over 305,000 troops to take the city of Pyongyang. After allowing the force to approach the city, Field Marshal Eulji Mundeok ambushed it. His forces attacked from all sides, driving the Sui troops back in utter confusion. His troops pursued the retreating army, slaughtering them at will. Records claim that only 2,800 men of the massive force returned alive to the main Chinese army. This battle, the Battle of Salsu, came to be known as one of the most glorious military triumphs in Korea's national history.

After the battle, winter began to set in and the Sui forces, short on provisions, were forced to return home in defeat.

Death
It is not known when Eulji Mundeok died. His name is not attested to after 613.

The Sui dynasty was beginning to disintegrate and Emperor Yang decided that he urgently needed to expand his empire in order to regain power, but two more attacks on Goguryeo in the following spring were met with similar disasters, and eventually internal rebellion in China forced him to abandon his desire for Goguryeo. By 618, the relatively short-lived Sui dynasty was replaced by the Tang dynasty. Field Marshal Eulji Mundeok's strategy and leadership had protected Goguryeo from Chinese expansion into the Korean peninsula.

Legacy
One of the most distinguished military leaders of the Goguryeo period, Eulji Mundeok's leadership and tactical acumen were the decisive factors in defeating the Sui invasion. Facing numerically superior forces, he developed a strategy that allowed him to secure a decisive victory. Such brilliant tactical success earned him a permanent place among Korea's most famous leaders. Kim Bu-sik, the author of the Samguk Sagi, also attributed the victory over Sui to Eulji Mundeok.

In Korea, Eulji Mundeok is recognized as one of the greatest figures in its national history. During the reign of Hyeonjong in the Goryeo period, a shrine to Eulji Mundeok was built near Pyongyang. In the succeeding Joseon period, he remained just as revered a figure. Yang Seong-ji, a scholar and high-ranking bureaucrat of 15th century Joseon, and An Jeong-bok, a Silhak historian of 18th century Joseon, both thought highly of him. Furthermore, King Sukjong ordered the construction of another shrine in honor of Eulji Mundeok in 1680.

At a time when Korea was suffering under the yoke of Japanese imperialism, a fuller assessment of Eulji Mundeok was commenced by the Korean historian Shin Chaeho, who published a biography of the famed general in 1908 and held him out as an example of Korea's traditional nationalist spirit. Eulji Mundeok is still celebrated as a national hero. One of the most preeminent Korean scholars of the 20th century, Lee Ki-baik, noted that Eulji Mundeok's efforts in halting the Sui attempt at conquest stand as one of the earliest examples of Korean attempts to fend off foreign domination.

In South Korea, a main thoroughfare in downtown Seoul, Euljiro, is named after Eulji Mundeok.

The second highest military decoration of South Korea is named after Eulji Mundeok.

The Republic of Korea Navy named a Gwanggaeto the Great-class destroyer in honor of Eulji Mundeok.

Eulji Mundeok's literary work, the Eulji Mundeok Hansi, is one of the oldest surviving poems in Korean literature.

One of the biannual Combined Forces Command exercises between South Korea and the United States was called Ulchi-Focus Lens (UFL) in honor of Eulji Mundeok. It was renamed to Ulchi-Freedom Guardian (UFG) in 2015. UFG is the world's largest computerized command and control exercise, focusing on how US and ROK forces would defend against a North Korean attack.

Popular culture

 * The playable character MoonDuck in the popular mobile game Crusaders Quest is based on Eulji Mundeok.
 * Eulji can be obtained through a seven days log-in event in the mobile game Mini Warriors.
 * Eulji is a playable character in the Mobile/PC Game Rise of Kingdoms.
 * Eulji Mundeok is a summonable Immortal in the mobile game Infinity Kingdom.

Television and film

 * Portrayed by Lee Jung-gil in 2006–2007 SBS TV series Yeon Gaesomun.