Admiral Yi Sun-sin : Episode Video#1 The Undefeated Naval Commander Who Defended a Nation Against Impossible Odds
Admiral Yi Sun-sin
The Undefeated Naval Commander Who Defended a Nation Against Impossible Odds
Admiral Yi Sun-sin was far more than a brilliant military commander.
He was a leader of extraordinary discipline, foresight, courage, and compassion—a man who protected his country even after being betrayed by the very government he served.
During the Japanese invasions of Korea in the late sixteenth century, Yi commanded the Joseon Navy and repeatedly defeated far larger enemy fleets. By controlling the seas and disrupting Japan’s supply lines, he helped prevent the complete destruction of the Joseon Kingdom.
In the major naval battles he personally commanded, Admiral Yi was never defeated.
For this reason, he is remembered not only as Korea’s greatest military hero, but also as one of the most remarkable naval commanders in world history.
1. Early Life
Name: Yi Sun-sin
Courtesy name: Yeohae
Posthumous title: Chungmugong, meaning “Lord of Loyal Valor”
Born: April 28, 1545
Birthplace: Geoncheon-dong, Hanseong, present-day Seoul
Died: 1598, during the Battle of Noryang
Famous work: Nanjung Ilgi, or The War Diary of Admiral Yi Sun-sin
Yi Sun-sin was born in 1545 as the third of four sons.
As a child, he was said to have enjoyed organizing neighborhood children into teams and leading them in mock battles. Even at a young age, he showed a strong sense of justice, responsibility, and leadership.
He initially studied the Confucian classics, as many educated young men of the Joseon Dynasty did. However, as he grew older, he chose the path of a military officer, believing that his duty was to protect his country.
His rise would not be easy.
His entire life would become a struggle—not only against foreign invaders, but also against injustice, political rivalry, personal tragedy, and despair.
2. A Late and Difficult Beginning
Yi Sun-sin’s military career did not begin with immediate success.
In 1572, at the age of twenty-eight, he took the military examination for the first time.
During the horseback-riding portion of the test, he fell from his horse and broke his leg. According to tradition, he tied the broken leg with branches from a willow tree, stood up, and attempted to continue the examination.
He did not pass that day.
But he did not surrender.
For several more years, he continued studying military strategy, archery, horsemanship, and martial skills. Finally, in 1576, at the age of thirty-two, Yi Sun-sin passed the military examination.
His career had begun later than those of many other officers.
Yet history would prove that greatness is not determined by how early a person succeeds, but by how faithfully that person continues after failure.
3. A Man Who Refused to Abandon His Principles
Yi Sun-sin was known for his honesty and uncompromising sense of duty.
He refused to flatter powerful officials. He would not misuse military supplies, manipulate appointments, or obey improper demands simply to advance his career.
His integrity earned the trust of soldiers and ordinary people.
But it also created enemies.
In 1587, while serving at Noktundo near Korea’s northern frontier, Yi helped defend the region against an attack by Jurchen forces. Despite fighting bravely and rescuing captured civilians, he was falsely blamed by a superior officer for the losses that had occurred.
Yi was stripped of his rank and ordered to serve as an ordinary soldier.
This punishment was known as baegui jonggun, meaning military service in white clothing—a symbol that the officer had lost his official status.
It was a deep humiliation.
Yet Yi did not run away, complain, or abandon his country.
He accepted the punishment and continued to serve.
In time, his achievements were recognized, and he was restored to military office.
It would not be the last time he was treated unjustly.
4. Preparing for a War Others Refused to See
In 1591, Yi Sun-sin was appointed Naval Commander of the Left Jeolla Province.
At the time, many officials in the Joseon government did not believe that Japan would launch a full-scale invasion. Some dismissed the danger. Others allowed political disagreements to prevent serious preparation.
Yi Sun-sin did not.
The moment he arrived at his post, he began preparing for war.
He repaired fortresses and naval bases.
He inspected warships and weapons.
He trained sailors and strengthened discipline.
He secured gunpowder, cannons, arrows, food, and military supplies.
He studied coastlines, islands, sea routes, currents, and tides.
He examined the ability and character of his officers.
He also worked with skilled shipbuilders and officers, including Na Dae-yong, to prepare the famous turtle ship for combat.
Yi did not wait for disaster before searching for a solution.
He imagined the worst that could happen—and prepared for it.
That preparation would soon save a nation.
5. The Turtle Ship and the Strength of the Joseon Navy
The basic concept of the turtle ship may have existed before Yi Sun-sin, but Yi and his officers improved it and prepared it for practical wartime use.
The ship had a covered upper deck designed to make it difficult for enemy soldiers to climb aboard. It could fire cannons in several directions and was used to break into enemy formations, create confusion, and support the main battle fleet.
However, the victories of Admiral Yi were not achieved by the turtle ship alone.
The main warship of the Joseon Navy was the panokseon, a large and sturdy vessel with a high deck and strong cannon-firing capabilities.
The real strength of Yi’s navy came from the combination of:
Powerful naval artillery
Strongly constructed warships
Disciplined formations
Accurate intelligence
Knowledge of tides and geography
Effective communication
Careful preparation
Unified command
Yi did not depend on one miraculous weapon.
He created a complete naval system.
6. The Japanese Invasion of 1592
In April 1592, a massive Japanese army launched an invasion of Korea under the command of Toyotomi Hideyoshi.
Japanese forces landed near Busan and quickly captured Busanjin and Dongnae. Armed with matchlock firearms and supported by experienced troops, they advanced northward with terrifying speed.
The Joseon Army suffered defeat after defeat.
The capital was abandoned.
King Seonjo and the royal court fled north.
To many Koreans, it appeared that the kingdom might collapse.
But the war at sea was about to tell a different story.
The invading Japanese armies depended heavily on ships to transport soldiers, weapons, food, and supplies along the southern coast.
If Japan controlled the sea, it could continue advancing deeper into Korea.
If the supply routes were broken, the invasion would become far more difficult.
Standing between Japan and complete control of the Korean Peninsula was Admiral Yi Sun-sin.
7. The Battle of Okpo
The First Great Victory
In May 1592, Yi Sun-sin led his fleet into battle for the first time.
Near Okpo, on the coast of Geoje Island, the Joseon Navy discovered Japanese ships anchored near the shore. Many Japanese soldiers had gone ashore to loot nearby villages.
Admiral Yi maintained order within his fleet and approached carefully.
Instead of allowing the Japanese soldiers to board Korean ships and fight at close range, he kept his distance and ordered his warships to fire their cannons.
The Japanese ships were destroyed one after another.
The Battle of Okpo became one of the first major victories for Joseon after the invasion began.
At a time when the nation had heard only news of defeat, Yi’s victory gave the Korean people something they desperately needed.
Hope.
8. The Battle of Sacheon and the Turtle Ship
Later that month, the turtle ship entered major combat during the Battle of Sacheon.
Yi lured the Japanese fleet into a position favorable to the Joseon Navy. The turtle ship moved into the enemy formation, disrupting its order, while the panokseon warships followed with concentrated cannon fire.
During the battle, Admiral Yi was struck in the left shoulder by an enemy bullet.
He was wounded, but he did not leave his command.
He continued directing the battle until victory was secured.
Yi did not seek admiration for personal bravery.
He understood that the life of a commander belonged, in that moment, to every soldier depending upon his judgment.
9. The Battle of Hansan Island
The Crane Wing Formation
In July 1592, Admiral Yi achieved one of the greatest victories of his career at the Battle of Hansan Island.
A large Japanese fleet was positioned near the narrow waters of Gyeonnaeryang. Yi understood that fighting in a confined channel would limit the movement and firepower of his ships.
He therefore sent a small group of vessels forward to lure the Japanese fleet into the open sea near Hansan Island.
The Japanese took the bait.
As the enemy ships entered the wider waters, the Joseon fleet spread into the famous Crane Wing Formation, or hakikjin.
The ships formed a wide semicircle, like a crane opening its wings.
Then the Joseon Navy surrounded the enemy from several directions and unleashed concentrated cannon fire.
The Japanese fleet was devastated.
The victory prevented Japan from expanding its naval operations toward the western coast of Korea. It also disrupted plans to support Japanese armies advancing farther north.
The Battle of Hansan Island was not merely a tactical victory.
It changed the course of the war.
10. The Attack on Busan Harbor
In September 1592, Yi Sun-sin launched a bold attack against the Japanese naval base at Busan Harbor.
Busan was heavily defended and filled with Japanese ships and soldiers. Entering the harbor was extremely dangerous.
Nevertheless, the Joseon fleet advanced into enemy-controlled waters and attacked the anchored ships with cannon fire.
Many Japanese vessels were damaged or destroyed.
But victory came with sorrow.
One of Yi’s most trusted officers, Jeong Un, was killed in battle.
Admiral Yi grieved deeply.
To him, soldiers were not numbers to be sacrificed. He carefully recorded the names and achievements of his officers and men. He worried about the wounded and mourned the dead.
His greatness did not come from being indifferent to suffering.
It came from feeling that suffering—and continuing to carry the responsibility of command.
11. Commander of the Three Provincial Navies
Because of his victories, Yi Sun-sin was appointed Commander of the Naval Forces of the Three Provinces, giving him authority over the naval forces of Jeolla, Gyeongsang, and Chungcheong.
He established his main command center on Hansan Island.
There, Yi built more than a military base.
He created a complete wartime organization.
He trained sailors, repaired ships, gathered intelligence, produced weapons, and operated military farms to secure food.
He held examinations to identify capable officers.
He strengthened communication between naval units and prepared for a long war.
Hansan Island became the strategic heart of the Joseon Navy—a command center, training ground, supply base, shipyard, and intelligence headquarters.
Yi understood that battles are not won only on the day the cannons fire.
They are won during the months and years of preparation before that day arrives.
12. The War Diary
The Heart of a Warrior
Throughout the war, Admiral Yi kept a personal diary known as the Nanjung Ilgi, or War Diary.
In it, he recorded:
Military operations
Weather and sea conditions
The movement of enemy forces
The condition of his ships
Food and supply shortages
The actions of officers and soldiers
Orders from the royal court
His illnesses and physical pain
His worries for the people
His love for his mother
His grief over fallen soldiers
His loneliness and fear
The diary does not present Yi Sun-sin as a superhuman figure without emotion.
It reveals a man who was often sick, exhausted, worried, and heartbroken.
He experienced fear.
He felt anger.
He suffered from loneliness.
He grieved for his family and his men.
Yet day after day, he rose and returned to his duty.
That is what makes his courage so powerful.
Courage is not the absence of fear.
Courage is the decision to continue despite fear.
13. Betrayed by the Government He Defended
Despite his extraordinary victories, Admiral Yi became the target of political jealousy and false accusations.
In 1597, as Japan prepared for a second invasion, a Japanese double agent provided Joseon officials with false information about the movements of the Japanese fleet.
The royal court ordered Yi to attack based on this questionable intelligence.
Yi examined the situation and concluded that the location was dangerous, the information unreliable, and the proposed operation likely to destroy the Joseon Navy.
He refused to recklessly sacrifice his fleet.
King Seonjo interpreted Yi’s caution as disobedience.
The admiral who had saved the country was arrested, taken to the capital in chains, imprisoned, and tortured.
He was nearly sentenced to death.
Only the intervention of several officials saved his life.
Once again, Yi Sun-sin was stripped of his rank and ordered to serve as an ordinary soldier.
Once again, he obeyed.
The nation had humiliated him.
But he still refused to abandon it.
14. The Death of His Mother and Son
While traveling to serve again as a common soldier, Yi received the devastating news that his mother had died.
He had loved and respected her deeply.
Throughout the war, he had worried constantly about her safety. Now, because he was being punished and sent back to the battlefield, he could not properly remain with his family or mourn her death.
In his diary, his sorrow is overwhelming.
He wrote as a son whose heart had been broken.
Later, his third son, Yi Myeon, was killed while fighting Japanese soldiers.
The admiral who carried the fate of a nation also carried the grief of a son and a father.
He lost his mother.
He lost his child.
He lost his rank.
He lost the trust of his king.
But he did not lose his sense of duty.
15. The Disaster at Chilcheollyang
After Yi Sun-sin was removed, Won Gyun was appointed commander of the Joseon Navy.
In 1597, the fleet was sent into a disastrous battle at Chilcheollyang.
The result was catastrophic.
Most of the Joseon fleet was destroyed. Thousands of sailors were killed or scattered. The naval force that Yi had spent years building nearly disappeared in a single defeat.
The sea lanes were left exposed.
The kingdom was once again in mortal danger.
Only then did the royal court turn back to the man it had imprisoned and humiliated.
Yi Sun-sin was reappointed as naval commander.
What he inherited was not a navy.
It was the wreckage of one.
The surviving soldiers were frightened and demoralized. Weapons, supplies, ships, and food were scarce.
Some government officials suggested that the navy should be abolished and its remaining men transferred to the army.
Admiral Yi refused.
He sent a message to the king:
“I still have twelve warships under my command.”
He declared that as long as he remained alive, the enemy would not dare to look down upon the Joseon Navy.
There are moments in history when hope is not a feeling.
It is a decision.
Yi Sun-sin made that decision.
16. The Battle of Myeongnyang
Thirteen Ships Against a Vast Fleet
On October 26, 1597, Admiral Yi faced an overwhelming Japanese fleet in the narrow waters of Myeongnyang Strait, also known as Uldolmok.
Yi had only thirteen battle-ready warships.
The Japanese fleet was vastly larger.
Under ordinary conditions, the battle would have been impossible.
But Yi did not choose an ordinary battlefield.
He had carefully studied the Myeongnyang Strait, where the passage was narrow and the current was fast, violent, and constantly changing.
The confined waters would prevent the larger Japanese fleet from attacking all at once.
The strong current would disrupt enemy formations.
The narrow channel would allow the Joseon ships to concentrate their cannon fire on the vessels approaching at the front.
Before the battle, Yi told his soldiers:
“Those who seek death shall live.
Those who seek life shall die.”
The words did not mean that life was worthless.
They meant that survival could come only when fear no longer controlled their actions.
At the beginning of the battle, many Joseon ships hesitated.
The memory of the disaster at Chilcheollyang was still fresh.
The soldiers were terrified.
So Admiral Yi moved his flagship forward.
For a time, he stood almost alone against the approaching enemy fleet.
Cannon fire thundered across the water.
Arrows and bullets filled the air.
The flagship endured attack after attack.
Yi did not retreat.
When the other commanders saw their admiral still fighting at the front, they regained their courage and joined him.
The current turned.
The Japanese formation collapsed.
Joseon cannon fire tore through the enemy ships.
Against overwhelming odds, Admiral Yi won.
The Battle of Myeongnyang became one of the most extraordinary naval victories in history.
17. Myeongnyang Was Not a Miracle of Luck
The victory at Myeongnyang is often described as a miracle.
But it was not a victory created by luck alone.
It was the result of:
Knowledge of Geography
Yi selected a narrow strait where the enemy’s numerical advantage could not be fully used.
Understanding of Tides
He knew that the violent current would change direction and disrupt the Japanese fleet.
Superior Artillery
Joseon ships fought effectively at a distance, using powerful cannons against an enemy that preferred close combat and boarding.
Strong Warships
The panokseon was sturdy, stable, and well suited for cannon warfare.
Discipline
Even after suffering disaster, the surviving sailors were reorganized into a functioning naval force.
Leadership
Admiral Yi did not command from safety.
He placed his own ship at the most dangerous point in the battle.
Trust
His men returned to the fight because they believed in the commander who refused to abandon them.
Myeongnyang was a triumph of strategy, preparation, courage, and leadership.
It proved that numbers do not always decide a battle.
Sometimes, the decisive force is the will of a leader who understands both the battlefield and the human heart.
18. Rebuilding the Navy Once More
After Myeongnyang, Admiral Yi began rebuilding the Joseon Navy.
He established new bases at Gohado and Gogeumdo.
He recruited sailors, repaired ships, restored supplies, and reestablished naval control along the southern coast.
He also cooperated with the Ming Chinese Navy under Admiral Chen Lin.
The relationship was not always easy at first. Differences in command, culture, and military interests created tension.
But Yi treated Chen Lin with respect while remaining firm in matters of strategy.
Over time, the Ming commander came to admire Yi’s ability, character, and leadership.
By 1598, Toyotomi Hideyoshi had died, and Japanese forces began withdrawing from Korea.
Yi believed that allowing the retreating army to escape without resistance would leave open the possibility of another invasion.
The war had to end decisively.
19. The Battle of Noryang
“Do Not Let My Death Be Known”
Before dawn on December 16, 1598, the combined Joseon and Ming fleets attacked the retreating Japanese forces near Noryang Strait.
The battle continued through the darkness and into the morning.
It was fierce, chaotic, and bloody.
Admiral Yi stood at the front, directing his men and beating the war drum to signal his fleet.
Victory was near.
Then an enemy bullet struck him.
Yi understood immediately that the wound was fatal.
But even in his final moment, his thoughts were not of himself.
He feared that if his soldiers learned of his death, their courage would collapse and the battle formation would fall into confusion.
According to tradition, his final command was:
“The battle is at its height.
Do not let my death be known.”
His body was concealed.
The war drum continued to sound.
His nephew and officers carried on the command as though the admiral were still alive.
The allied fleet won the Battle of Noryang.
The seven-year war came to an end.
Admiral Yi Sun-sin died at the age of fifty-three, in the final battle of the war, at the moment of victory.
He had given everything he possessed to his country.
Even his final breath.
20. A Nation Mourns
When news of Admiral Yi’s death spread, soldiers, officers, and ordinary people mourned deeply.
He had defended a government that had doubted him.
He had protected a king who had imprisoned him.
He had continued serving a country that had taken away his rank and nearly his life.
Yet his loyalty was not blind obedience to a ruler.
It was devotion to the people, the land, and the generations that would come after him.
In 1643, he received the posthumous title Chungmugong, meaning “Lord of Loyal Valor.”
Memorials were built in his honor, including Hyeonchungsa Shrine in Asan.
His war diary, letters, military reports, and achievements have been preserved as part of Korea’s national heritage.
But his greatest memorial is not made of stone.
It lives in the memory of a people who survived because he refused to give up.
21. Why Admiral Yi Is Remembered as Undefeated
Admiral Yi Sun-sin’s greatness cannot be explained by victory alone.
He Prepared Before the Crisis
He repaired ships, trained soldiers, gathered supplies, and studied the sea before the invasion began.
He Chose His Battles Wisely
He did not fight where the enemy was strongest. He used geography, tides, and intelligence to create advantages.
He Built a System, Not Just a Fleet
His victories came from organization, communication, logistics, discipline, and unified command.
He Valued His Soldiers
He recorded their achievements, mourned their deaths, and understood that leadership required responsibility for human lives.
He Put Duty Above Personal Pain
He continued serving after imprisonment, torture, humiliation, and the deaths of his mother and son.
He Led from the Front
At Myeongnyang, he placed his flagship between the enemy and his terrified fleet.
He Remained Humble
Even after great victories, his diary shows little pride. Instead, he worried about the next battle, his wounded men, and the suffering of the people.
22. He Was Not a Man Without Fear
Admiral Yi was not fearless.
His diary tells us that he worried constantly.
He suffered from illness and exhaustion.
He feared for his family.
He felt anger toward corrupt officials.
He was often lonely.
He wept for his mother.
He mourned his son.
He grieved for the soldiers who died under his command.
What made him extraordinary was not that he felt no fear, sorrow, or pain.
It was that he did not allow them to decide his duty.
True courage does not belong only to those who feel strong.
True courage belongs to those who continue even when their hearts are breaking.
23. His Strategic Importance
Admiral Yi’s naval victories did more than protect Korea’s southern coast.
The Japanese armies advancing through Korea required constant supplies of food, weapons, reinforcements, and ammunition from the sea.
By attacking Japanese fleets and controlling major sea routes, Yi disrupted those supply lines.
His victories prevented Japan from freely entering the western seas and expanding its naval support toward Hanseong and Pyongyang.
This gave Korean soldiers, volunteer militias, and Ming reinforcements the time and opportunity to continue resisting.
Yi Sun-sin did not merely win individual battles.
He changed the strategic direction of the entire war.
Without his control of the sea, the history of Korea—and perhaps the history of East Asia—might have been very different.
24. The Spirit of Admiral Yi Sun-sin
The life of Admiral Yi continues to represent values that remain meaningful today.
Preparation
A crisis must be prepared for before it arrives.
Responsibility
A leader does not abandon duty when circumstances become difficult.
Integrity
True loyalty is not obedience to corruption, but faithfulness to principle.
Compassion
Soldiers and citizens are not tools. Their lives matter.
Leadership by Example
A leader must stand at the front before asking others to follow.
Perseverance
Failure, humiliation, and injustice do not have to become the end of a person’s story.
Courage
Fear may remain, but it does not have to control our actions.
A Brief Timeline
| Year | Major Event |
|---|---|
| 1545 | Born in Hanseong, present-day Seoul |
| 1572 | Injured during his first military examination |
| 1576 | Passed the military examination |
| 1587 | Falsely blamed after the fighting at Noktundo and reduced to the rank of common soldier |
| 1591 | Appointed Naval Commander of the Left Jeolla Province |
| 1592 | Japanese invasion began; victories at Okpo, Sacheon, Hansan Island, and Busan |
| 1593 | Appointed Commander of the Naval Forces of the Three Provinces |
| 1597 | Arrested, tortured, and sent to serve as a common soldier |
| 1597 | Reappointed after the destruction of the Joseon fleet at Chilcheollyang |
| 1597 | Won the Battle of Myeongnyang with only thirteen warships |
| 1598 | Killed during the victorious Battle of Noryang |
| 1643 | Awarded the posthumous title Chungmugong |
| 1707 | Hyeonchungsa Shrine received royal recognition |
Conclusion
The Man Who Refused to Surrender
Admiral Yi Sun-sin did not achieve greatness under favorable conditions.
He fought with insufficient troops.
He commanded damaged ships.
He suffered from illness.
He was betrayed by officials, imprisoned by his government, stripped of his rank, and forced to serve as a common soldier.
He lost his mother.
He lost his son.
He watched his country burn.
Yet when he was called upon again, he returned.
When only a few ships remained, he did not say that the battle was impossible.
He said:
“I still have twelve warships under my command.”
Those words were more than a military report.
They were a declaration that hope still existed.
They were the promise of a commander who would not abandon his people.
They were the voice of a man who believed that even when almost everything has been lost, duty remains.
Admiral Yi Sun-sin gave his life in the final battle of the war.
His last concern was not his own death, but the courage of his soldiers and the outcome of the battle.
“The battle is at its height.
Do not let my death be known.”
For more than four centuries, his story has continued to inspire people around the world.
He is remembered not simply because he never lost a major naval battle.
He is remembered because he showed humanity what leadership looks like in the darkest hour.
When others saw defeat, he prepared.
When others surrendered to fear, he moved forward.
When his country betrayed him, he still defended its people.
And when death came for him, he continued commanding until victory was secured.
That is why Admiral Yi Sun-sin remains more than a hero of Korea.
He is an enduring symbol of courage, sacrifice, integrity, and hope.
Comments
Post a Comment