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Douglas MacArthur
UN / South Korea

Douglas MacArthur

General of the Army

BornJanuary 26, 1880 · Little Rock, Arkansas
DiedApril 5, 1964 · Washington, D.C.
Height6'0"
EducationWest Point (1st in class, 1903)
Pre-warSupreme Commander Allied Powers Japan

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Douglas MacArthur

January 26, 1880April 5, 1964

Did you know?

MacArthur is one of only five men to achieve the rank of General of the Army (five stars) in the US military and the only person to serve as a field marshal in a foreign army (Philippines).

"In war, you win or lose, live or die — and the difference is just an eyelash."

Douglas MacArthur commanded UN forces in Korea from the war's opening days until his dramatic dismissal by President Truman in April 1951. A legendary figure from World War II, MacArthur engineered the brilliant Inchon landing that reversed the war's fortunes, then overreached by driving to the Yalu River despite clear warnings of Chinese intervention. His public challenge to Truman's limited-war strategy — advocating attacks on China and even use of nuclear weapons — forced Truman to relieve him, establishing the critical precedent of civilian control over military commanders in democratic society.

Key Battles

inchon landingliberation of seoulbattle of unsanpusan perimeter

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Matthew B. Ridgway
UN / South Korea

Matthew B. Ridgway

General

BornMarch 3, 1895 · Fort Monroe, Virginia
DiedJuly 26, 1993 · Fox Chapel, Pennsylvania
Height5'11"
EducationWest Point (Class of 1917)
Pre-warCommander, XVIII Airborne Corps, WWII

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Matthew B. Ridgway

March 3, 1895July 26, 1993

Did you know?

Ridgway was famous for always wearing live hand grenades on his webbing harness in the field — a habit that alarmed his staff but signaled to frontline troops that their commander was not afraid to fight.

"There are no bad regiments — only bad officers."

Matthew Ridgway arrived in Korea in December 1950 to take command of the shattered Eighth Army following General Walker's death in a jeep accident. What he found was an army in crisis of morale and confidence. In just weeks, through personal leadership — riding among frontline troops, asking soldiers what they needed, firing commanders who lacked aggressiveness — Ridgway transformed a defeated force into one capable of offensive action. He launched counteroffensives that recaptured Seoul and stabilized the front near the 38th parallel. When MacArthur was dismissed, Ridgway replaced him as supreme commander, skillfully navigating the transition to armistice negotiations.

Key Battles

fall of seoul 1951chipyong niheartbreak ridge

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Harry S. Truman
UN / South Korea

Harry S. Truman

Commander-in-Chief (President)

BornMay 8, 1884 · Lamar, Missouri
DiedDecember 26, 1972 · Kansas City, Missouri
Height5'9"
EducationNo college degree; Kansas City School of Law (did not graduate)
Pre-warUS Senator (Missouri), then Vice President

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Harry S. Truman

May 8, 1884December 26, 1972

Did you know?

Truman is the only president in history to have ordered the use of atomic weapons in combat (Hiroshima and Nagasaki, 1945) and yet steadfastly refused to authorize their use in Korea despite MacArthur's advocacy for doing so.

"The buck stops here."

President Harry Truman made the fateful decision to commit US forces to Korea within days of the North Korean invasion, framing intervention as a United Nations 'police action' to avoid a declaration of war. Truman fought the Korean War as a limited conflict, rejecting MacArthur's demands to expand the war to China. When MacArthur openly challenged civilian authority in April 1951, Truman fired him — one of the most consequential and politically costly decisions in American presidential history. The dismissal upheld the constitutional principle of civilian control over the military but devastated Truman's popularity, contributing to his decision not to seek re-election in 1952.

Key Battles

task force smithpusan perimeterinchon landing

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Oliver P. Smith
UN / South Korea

Oliver P. Smith

Major General

BornOctober 26, 1893 · Menard, Texas
DiedDecember 25, 1977 · Los Altos, California
Height6'1"
EducationUniversity of California, Berkeley (BA 1916); Marine Corps schools
Pre-warAssistant Commandant of the Marine Corps

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Oliver P. Smith

October 26, 1893December 25, 1977

Did you know?

Smith so distrusted Almond's orders that he secretly slowed his division's advance toward the Yalu, spacing his regiments to prevent the encirclements Almond ordered — a calculated act of disobedience that saved thousands of Marine lives.

"Retreat, hell! We're just attacking in a different direction."

Major General Oliver P. Smith commanded the 1st Marine Division through the Inchon landing, the liberation of Seoul, and the legendary ordeal at the Chosin Reservoir. A methodical, careful commander who inspired intense loyalty, Smith repeatedly clashed with his impetuous superior Edward Almond over the reckless pace of the advance to the Yalu. Smith quietly prepared for Chinese intervention — stockpiling supplies and improving a single road — preparations that saved his division when 120,000 Chinese troops surrounded his 15,000 Marines at Chosin. His steady leadership through the fighting withdrawal to Hungnam became one of the most celebrated episodes in Marine Corps history.

Key Battles

inchon landingliberation of seoulchosin reservoir

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Walton H. Walker
UN / South Korea

Walton H. Walker

Lieutenant General

BornDecember 3, 1889 · Belton, Texas
DiedDecember 23, 1950 · Seoul, South Korea (jeep accident)
Height5'8"
EducationWest Point (Class of 1912)
Pre-warCorps Commander under Patton, WWII

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Walton H. Walker

December 3, 1889December 23, 1950

Did you know?

Walker's son, Captain Sam Walker, was serving in Korea at the same time as his father and was present when General Walker died. Sam Walker went on to become a general himself.

"Stand or die. There will be no more retreating, withdrawal, or readjustment of the lines."

General Walton 'Bulldog' Walker commanded the Eighth Army during the desperate defense of the Pusan Perimeter in the summer of 1950 — the moment that determined whether South Korea would survive at all. His famous 'stand or die' order of July 29, 1950, steadied demoralized troops and characterized his aggressive, unyielding command style. Walker had served under Patton in World War II, absorbing his mentor's offensive spirit. After the Inchon breakout, Walker led the rapid advance north, then conducted the harrowing retreat as Chinese forces poured south. He was killed in a jeep accident on December 23, 1950, while his army was in crisis.

Key Battles

pusan perimeterliberation of seoulbattle of unsan

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Peng Dehuai
North Korea / China

Peng Dehuai

General (Commander, Chinese People's Volunteer Army)

BornOctober 24, 1898 · Xiangtan County, Hunan, China
DiedNovember 29, 1974 · Beijing, China (persecuted during Cultural Revolution)
Height5'7"
EducationHunan Military Academy; self-educated military theorist
Pre-warCommander, First Field Army, Chinese Civil War

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Peng Dehuai

October 24, 1898November 29, 1974

Did you know?

Peng was later imprisoned and tortured to death during Mao Zedong's Cultural Revolution for daring to criticize the catastrophic Great Leap Forward — an ironic end for the commander who had saved Mao's regime in Korea.

"The imperialists must learn that the Chinese people have stood up."

General Peng Dehuai commanded the Chinese People's Volunteer Army throughout the Korean War — one of the most consequential military commands of the Cold War era. A veteran of the Long March and the Chinese Civil War, Peng led the massive intervention of October 1950 that reversed the UN advance and nearly expelled UN forces from Korea entirely. His winter offensives drove UN forces from North Korea and captured Seoul, but were eventually blunted by Ridgway's rebuilt Eighth Army. Peng negotiated the armistice in 1953. Despite his military success, he later clashed with Mao and suffered terribly during the Cultural Revolution.

Key Battles

battle of unsanchosin reservoirfall of seoul 1951chipyong niheartbreak ridgepork chop hillbattle of the hook

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Kim Il-sung
North Korea / China

Kim Il-sung

Supreme Leader / Marshal

BornApril 15, 1912 · Mangyongdae, near Pyongyang, Korea
DiedJuly 8, 1994 · Pyongyang, North Korea
Height5'7"
EducationYuwen Middle School, Jilin, China; Soviet military training
Pre-warSoviet-installed leader of North Korea; guerrilla commander

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Kim Il-sung

April 15, 1912July 8, 1994

Did you know?

Kim Il-sung fought as a guerrilla against Japanese occupation in Manchuria in the 1930s, then spent years in the Soviet Union before being installed as North Korea's leader by Stalin in 1945.

"The Korean people are capable of overcoming all difficulties and trials."

Kim Il-sung ordered the June 1950 invasion of South Korea with Soviet support, calculating that the United States would not intervene. The gamble nearly succeeded — North Korean forces overran most of the South within weeks. But US and UN intervention turned the war around, and by October 1950 UN forces were advancing toward the Chinese border. Kim's regime was saved only by Chinese intervention at Peng Dehuai's insistence. The armistice of 1953 left the peninsula divided roughly where it had started. Kim ruled North Korea with absolute power until his death in 1994, founding a dynastic dictatorship that persists today.

Key Battles

task force smithpusan perimeterinchon landingbattle of unsan

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Paik Sun-yup
UN / South Korea

Paik Sun-yup

General

BornNovember 23, 1920 · Pyongyang, Korea (present-day North Korea)
DiedJuly 10, 2020 · Seoul, South Korea
Height5'8"
EducationManchukuo Military Academy; Korean Military Academy
Pre-warRegimental commander, Republic of Korea Army

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Paik Sun-yup

November 23, 1920July 10, 2020

Did you know?

Paik Sun-yup lived to age 99, dying in 2020, making him one of the last surviving senior commanders of the Korean War. He wrote influential memoirs that became essential reading at military academies worldwide.

"We had nothing. No tanks, no planes, no heavy artillery. But we had the will to fight for our country."

Paik Sun-yup was the most celebrated South Korean commander of the Korean War and the first South Korean officer to achieve four-star rank. As a 29-year-old colonel commanding the ROK 1st Division, he fought brilliantly during the desperate early days when South Korean forces were being swept away. His division held the vital Tabu-dong corridor during the Pusan Perimeter battles, preventing the fall of Taegu. Paik advanced rapidly, commanding a corps and then becoming Chief of Staff of the ROK Army. He earned the deep respect of American commanders for his tactical skill, personal courage, and ability to inspire his soldiers in the most desperate circumstances.

Key Battles

pusan perimeterliberation of seoulbattle of unsan

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Dean Acheson
UN / South Korea

Dean Acheson

Secretary of State

BornApril 11, 1893 · Middletown, Connecticut
DiedOctober 12, 1971 · Sandy Spring, Maryland
Height6'0"
EducationYale University (BA 1915); Harvard Law School (LLB 1918)
Pre-warSecretary of State (1949–1953); private law practice

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Dean Acheson

April 11, 1893October 12, 1971

Did you know?

Acheson's famous mustache became a caricature target for McCarthyite critics who accused him of being soft on communism — despite the fact that he was the principal architect of NATO and the Marshall Plan.

"No people in history have been known to flee from freedom."

As Secretary of State under President Truman, Dean Acheson was the chief architect of America's Cold War containment strategy and shaped US policy in Korea at every critical juncture. In January 1950, his famous speech defining America's 'defense perimeter' in Asia — which appeared to exclude South Korea — was later cited by some historians as inadvertently inviting the North Korean invasion. Acheson then led the diplomatic effort to build the UN coalition that defended South Korea. After China's intervention, he counseled against expanding the war, supporting Truman's firing of MacArthur and the strategy of limited war. The armistice represented a fundamental validation of his containment doctrine.

Key Battles

task force smithpusan perimeter

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James Van Fleet
UN / South Korea

James Van Fleet

General

BornMarch 19, 1892 · Coytesville, New Jersey
DiedSeptember 23, 1992 · Polk City, Florida
Height6'2"
EducationWest Point (Class of 1915, same class as Eisenhower and Bradley)
Pre-warCommander, III Corps, European Theater WWII

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James Van Fleet

March 19, 1892September 23, 1992

Did you know?

Van Fleet graduated in the famous 'Class the Stars Fell On' at West Point in 1915 — a class that produced 59 generals, including Dwight D. Eisenhower and Omar Bradley. His son's death in Korea deeply affected him and he remained bitter about the limited-war constraints until his death.

"The purpose of an army is to fight, and the purpose of fighting is to win."

General James Van Fleet commanded the Eighth Army from April 1951 until early 1953, leading UN forces through the grinding stalemate phase of the war. A hard-charging commander who had led troops from D-Day through the end of World War II, Van Fleet was frustrated by the restrictions of limited war and the political constraints that prevented him from using the full firepower at his disposal. He oversaw the brutal battles of Heartbreak Ridge and Pork Chop Hill and controversially was denied permission to launch major offensives that he believed could have ended the war on more favorable terms. His son, James Van Fleet Jr., was killed in a B-26 bombing raid over North Korea.

Key Battles

heartbreak ridgepork chop hillchipyong ni

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