Battle of Chosin Reservoir (1950): Fighting Retreat in the Cold

The Battle of Chosin Reservoir was fought in the mountains of northeastern North Korea from 27 November to 13 December 1950, during the Korean War. Chinese forces surprised and surrounded UN troops, mainly the US 1st Marine Division and US Army units, around the frozen Chosin (Changjin) Reservoir. In bitter cold the encircled troops fought their way roughly 125 kilometres to the coast, where they were evacuated by sea, in one of the most famous fighting withdrawals in modern military history.

Background: the race to the Yalu

After the Battle of Inchon in September 1950, UN forces crossed the 38th parallel and advanced deep into North Korea. General Douglas MacArthur aimed to reach the Yalu River on the Chinese border and end the war by Christmas.

In the east, X Corps under Major General Edward Almond was landed at Wonsan and Iwon in late October and pushed north into rugged mountains. The 1st Marine Division, commanded by Major General Oliver P. Smith, moved up a single narrow road from the port of Hungnam toward the reservoir. Smith was uneasy about the scattered deployment and deliberately slowed his advance, stockpiling supplies and building an airstrip at Hagaru-ri, at the southern tip of the reservoir.

China had already intervened. From October, the Chinese People’s Volunteers had crossed the Yalu, fought short battles and then withdrawn. UN commanders underestimated how many troops were in the mountains. The Chinese 9th Army Group under Song Shilun, estimated at around 120,000 men, had moved into the area largely undetected, marching at night and hiding by day.

The Chinese attack

On the night of 27 November 1950 Chinese forces struck. West of the reservoir, at Yudam-ni, two Marine regiments were attacked by several Chinese divisions. Other attacks cut the road behind them, isolating the Marine positions at Yudam-ni, Hagaru-ri and Koto-ri from each other.

East of the reservoir, a US Army force of around 3,000 men from the 7th Infantry Division, later known as Task Force Faith after its commander Lieutenant Colonel Don Carlos Faith, was surrounded. Its attempt to break out on 1 December ended in disaster. Faith was mortally wounded, and only about a third of the force, many of them wounded or frostbitten, reached Marine lines across the ice of the reservoir.

On 29 November a relief column, Task Force Drysdale, made up of British Royal Marines of 41 Independent Commando, US Marines and Army soldiers, fought its way from Koto-ri to Hagaru-ri. It lost heavily on the road, in a stretch that became known as Hell Fire Valley, but its survivors helped strengthen the defence of the vital airstrip.

The breakout to the sea

General Smith ordered his regiments to concentrate and fight their way back down the road, bringing their wounded and as much equipment as possible. From 1 to 4 December the Marines at Yudam-ni fought through the mountains to Hagaru-ri. There, transport aircraft using the improvised airstrip flew out more than 4,000 wounded and frostbitten men.

On 6 and 7 December the combined force fought from Hagaru-ri to Koto-ri. The next obstacle was the Funchilin Pass, where the Chinese had blown a bridge over a sheer drop beside a power station. On 7 December US Air Force C-119 transport aircraft parachuted sections of a steel treadway bridge to the troops, and engineers installed them on 9 December, allowing the column, with its vehicles, to cross.

The rearguard passed through the pass on the night of 10 December, and the last units reached the Hungnam perimeter by 11 December. Throughout the breakout, close air support from Marine, Navy and Air Force aircraft attacked Chinese positions along the road.

The cold

The weather made the battle notorious. A Siberian cold wave brought night temperatures of around minus 30 degrees Celsius or lower, with strong winds. Rifles and machine guns jammed, artillery recoil mechanisms slowed, rations froze solid, and plasma and morphine had to be kept warm against the body. Frostbite affected thousands of UN soldiers.

The Chinese troops suffered even more. Many wore thin padded cotton uniforms and canvas shoes, with little food and no shelter, and whole units were found frozen in their positions. Chinese sources acknowledge that losses from cold were as great as or greater than losses from combat.

Key people

• Oliver P. Smith (1893–1977), commander of the 1st Marine Division, credited with keeping the division together.
• Song Shilun (1907–1991), commander of the Chinese 9th Army Group.
• Edward Almond (1892–1979), commander of X Corps, criticised for dispersing his forces.
• Don Carlos Faith (1918–1950), Army commander east of the reservoir, posthumously awarded the Medal of Honor.

Casualties and the Hungnam evacuation

Casualty figures vary between sources. UN forces suffered roughly 15,000 to 18,000 casualties, including several thousand cases of frostbite and other non-battle injuries; the Army units east of the reservoir lost most heavily in proportion to their size. Estimates of Chinese casualties range from about 40,000 to 60,000 or more, with cold causing a large share of them. Chinese sources put the combined total close to 50,000.

From the coast, X Corps was evacuated by sea from the port of Hungnam. Between 15 and 24 December some 100,000 troops and about 98,000 Korean civilians were taken off, along with vehicles and supplies. The merchant ship SS Meredith Victory alone carried around 14,000 refugees. On 24 December the port facilities were blown up to deny them to the enemy.

Legacy

The battle quickly became part of the identity of the US Marine Corps, which regards it as one of its defining actions. More than a dozen Medals of Honor were awarded for the campaign, most of them to Marines, and veterans called themselves the “Chosin Few”. The Army’s ordeal east of the reservoir was long overshadowed, and only in later decades did historians and veterans’ groups give Task Force Faith fuller recognition.

In China the battle is remembered under the name Changjin Lake as a victory that drove American forces out of northeastern Korea. It has been the subject of major Chinese films, including The Battle at Lake Changjin (2021), which became one of the highest-grossing films in Chinese history.

For Koreans, the Hungnam evacuation has a special meaning. Many of the refugees carried south were separated permanently from relatives who stayed behind, and their descendants include prominent South Korean figures. The story of the Meredith Victory, which landed its passengers safely at Geoje Island on 25 December, is still retold in South Korea as the “ship of miracles”. Remains of soldiers who died around the reservoir are still being identified and repatriated decades later.

Timeline

• 1950, late October: X Corps lands on the east coast of North Korea.
• 1950, 27 November: Chinese forces attack around the Chosin Reservoir.
• 1950, 29 November: Task Force Drysdale fights its way to Hagaru-ri.
• 1950, 1 December: Task Force Faith is destroyed east of the reservoir.
• 1950, 1–4 December: Marines break out from Yudam-ni to Hagaru-ri.
• 1950, 6–7 December: The column fights from Hagaru-ri to Koto-ri.
• 1950, 9 December: Engineers install the air-dropped bridge at Funchilin Pass.
• 1950, 11 December: The last units reach the Hungnam perimeter.
• 1950, 24 December: The Hungnam evacuation is completed.

Why it matters

Chosin ended the UN drive to the Yalu and showed that China was a formidable military force, setting the stage for the long stalemate that followed. For the Marines and soldiers who survived, and for the refugees carried south from Hungnam, the battle became a defining memory of the war; it also fed the tensions that led to MacArthur’s dismissal in April 1951.