Battlefield Atlas
Korean War · 1950 Members · from $3

Chosin Reservoir, 27 November – 13 December 1950

From 27 November to 13 December 1950, in some of the coldest weather ever fought in, about 30,000 UN troops of X Corps — the 1st Marine Division, the Army's RCT-31 (Task Force Faith) and British 41 Commando — were surrounded around the Chosin (Changjin) Reservoir in North Korea by the Chinese 9th Army Group, roughly 120,000 men by the older estimates (some historians now say nearer 60,000). East of the reservoir RCT-31 was destroyed. West of it the Marines broke out from Yudam-ni through Toktong Pass, where Fox Company held for five days, regrouped at Hagaru-ri and its airstrip, and fought their way 78 miles to the sea — crossing Funchilin Pass on a bridge dropped by parachute — to be evacuated from Hungnam.

Open the interactive map8 stages on modern satellite imagery and terrain, with 3D elevation

This battle opens with Battlefield Enjoyer ($3 a month on Patreon), which unlocks every battle in the atlas and every one added later. Free battles include Yorktown, Waterloo, The Alamo, Antietam, Little Bighorn, Belleau Wood, Omaha Beach, Ia Drang.

The breakout
The breakout — U.S. Marine Corps — public domain

The battle, stage by stage

  1. 27 November 1950, afternoon

    Spread along the road

    X Corps' 1st Marine Division is strung out for some 78 miles along a single mountain road climbing from Hamhung to the Chosin Reservoir. Two regiments — Murray's 5th and Litzenberg's 7th Marines — are at Yudam-ni, west of the reservoir, where 2/5 attacks west that morning and is stopped within about a kilometre. Fox Company, 7th Marines, holds a hill over Toktong Pass, the summit of the 14-mile road back to Hagaru-ri; at Hagaru-ri a single Marine battalion guards the division command post and the half-built airstrip; Puller's 1st Marines hold Koto-ri and Chinhung-ni. East of the reservoir the Army's RCT-31 (Col. Allan MacLean) is split between an inlet perimeter about eight road miles north of Hagaru-ri and Lt. Col. Don Faith's 1/32 Infantry a few miles further on. In the hills around them, Song Shilun's 9th Army Group — eight divisions of the 20th and 27th Armies — has moved in unseen. Temperatures fall toward -30 F.

  2. Night of 27–28 November

    The hills come alive

    After dark the Chinese strike almost everywhere at once. At Yudam-ni the 79th Division hits North Ridge (Hills 1282 and 1240), held by two companies of the 7th Marines, and the 89th the ridges to the west and south-west; some positions are overrun and retaken by counterattack before dawn. The 59th Division cuts the road south, falling on Charlie Company 1/7 and on Barber's Fox Company at Toktong Pass. East of the reservoir the 80th Division, reinforced by a regiment of the 81st, assaults Faith's battalion and the inlet perimeter, where the 3/31 and 57th Field Artillery positions are partly overrun. By morning every UN position north of Koto-ri is cut off.

  3. 28–30 November

    Hagaru-ri and Hell Fire Valley

    The 58th Division, arriving late, attacks the thinly held Hagaru-ri perimeter on the night of 28–29 November; engineers and clerks fight beside 3/1 Marines, and the Chinese take part of East Hill, which is never fully cleared. On 29 November Task Force Drysdale — 41 Commando Royal Marines, G Company 1st Marines and B Company 31st Infantry, 921 men — pushes north from Koto-ri; the 60th Division cuts it in two in 'Hell Fire Valley'. About 300 infantry reach Hagaru-ri; the task force loses 162 dead or missing and 159 wounded. East of the reservoir Faith's battalion falls back to the inlet; MacLean, walking toward troops he took for his own, is shot and captured and dies days later. Faith takes command. At Yudam-ni the two Marine regiments pull into a tighter ring; Fox Company, supplied by air drops, holds on.

  4. 1 December

    Task Force Faith

    With no relief coming, Faith breaks out south on 1 December, with some 2,500 men and the wounded in trucks. A misdirected napalm strike falls on the lead platoons; at a blown bridge and then under Hill 1221 the column is stopped by roadblocks. Faith, leading an assault on the block, is mortally wounded by a grenade, and after dark the column breaks apart near Hudong-ni. Survivors — by one count about 1,050 men, only 385 of them fit to fight — walk across the reservoir ice to Hagaru-ri. The same day the first C-47 lands on the new Hagaru-ri airstrip. At Yudam-ni the 5th and 7th Marines begin the breakout south, while Lt. Col. Raymond Davis's 1/7 leaves the road to march through the night across the mountains toward Fox Hill.

  5. 2–4 December

    Fox Hill and the road to Hagaru-ri

    Davis's battalion reaches Fox Hill on the morning of 2 December after a night march over snow-covered ridges. Fox Company has held for about five days and nights; reportedly only some 80 of its roughly 240 men can still fight (26 killed, 89 wounded, 3 missing, by one count). Barber, wounded, later receives the Medal of Honor, as does Davis. The 5th and 7th Marines fight down the road behind them with their wounded and many of their dead in trucks, the head of the column entering Hagaru-ri on 3 December and the rear on 4 December. From the Hagaru-ri airstrip transports fly out some 4,300 wounded and frostbitten men.

  6. 6–7 December

    Attacking in another direction

    'Retreat, hell! We're just attacking in another direction,' Smith is famously, if loosely, quoted. On 6 December the division — now with Army and Royal Marine survivors — sets out for Koto-ri, 11 miles south, the 7th Marines leading and the 5th Marines holding Hagaru-ri and East Hill behind them. Fresh divisions of the Chinese 26th Army attack the column and the rear guard; East Hill sees some of the heaviest fighting of the campaign. With Corsairs overhead by day, the column covers the distance in about 38 hours, the last units reaching Koto-ri on 7 December, and Hagaru-ri is destroyed behind them.

  7. 7–8 December

    A bridge from the sky

    South of Koto-ri the road clings to the side of Funchilin Pass. Where it crossed the penstocks of a hydroelectric plant, the Chinese have blown the bridge, leaving a gap — given as anything from 16 to 29 feet in different accounts — that no vehicle can cross. On 7 December Air Force C-119s parachute eight sections of steel Treadway bridge into Koto-ri (one is damaged and one falls to the Chinese, by most accounts). On 8 December, in a snowstorm, 1/1 Marines climbs north from Chinhung-ni to attack Hill 1081, which dominates the bridge site, while the division masses at Koto-ri.

  8. 9–11 December

    Down Funchilin Pass

    1/1 takes Hill 1081 on 9 December, and that afternoon engineers lay the Treadway sections, eked out with timber, across the gap; by one account the bridge was finished with only inches to spare on each side of the tank tracks. The column — vehicles, wounded, refugees following — files down the pass through the night and the next day. Tanks bringing up the rear are lost when one breaks down above the bridge. The last Marines are clear of the pass by 11 December, and the bridge is blown behind them. From Hamhung and Hungnam X Corps and about 100,000 Korean civilians are taken off by sea, the last ships sailing on 24 December. US losses in the campaign are most often given as about 1,029 killed, 4,894 missing and 4,582 wounded, with thousands more cold casualties; Chinese official figures give some 21,000 combat and 30,000 non-combat casualties.

Weapons

UN / X Corps (1st Marine Division, RCT-31)

M1 Garand

M1 Garand

Semi-automatic rifle · 1936–1958 (US standard rifle)

At Chosin Reservoir: Most Marines and soldiers carried the M1 rifle, which kept working in temperatures down to about -30°F better than most weapons when kept free of heavy oil.

The M1 Garand was the first semi-automatic rifle adopted as a nation's standard infantry weapon. It gave the American rifleman much more firepower than a bolt-action rifle, and General George Patton called it "the greatest battle implement ever devised."

Calibre
.30-06 Springfield
Effective range
about 460 m (500 yd)
Feed
8-round en-bloc clip
Photo: Armémuseum (Swedish Army Museum) · Public domain
M1 carbine

M1 carbine

Semi-automatic carbine · 1942–1970s (US); much longer in allied armies

At Chosin Reservoir: The lighter M1 carbine had a poor reputation at Chosin: men reported its rounds failing to stop padded-uniformed attackers and its action freezing in the cold.

The light M1 carbine was designed in World War II for soldiers who needed something handier than a full rifle. After the war it was supplied in large numbers to allied armies, and its small size made it popular with South Vietnamese troops.

Calibre
.30 Carbine
Magazine
15- or 30-round box
Weight
about 2.4 kg
Photo: Armémuseum (Swedish Army Museum) · CC BY-SA 4.0
M1918 Browning Automatic Rifle (BAR)

M1918 Browning Automatic Rifle (BAR)

Automatic rifle · 1918–1960s

At Chosin Reservoir: Browning Automatic Rifles gave each squad its base of fire in the night defences on the ridges around Yudam-ni, Fox Hill and Hagaru-ri.

John Browning's BAR first reached the front in September 1918 and became the automatic weapon at the heart of the US rifle squad in World War II. The M1918A2 version added a bipod and a two-speed rate of fire.

Calibre
.30-06 Springfield
Magazine
20-round box
Rate of fire
M1918A2: selectable slow/fast, roughly 300–650 rounds/min
Weight
about 8.8 kg (M1918A2)
Photo: Public domain · Wikimedia Commons

Paintings and photographs

The breakout
The breakout A column of the 1st Marine Division moves through Chinese lines during the breakout from the Chosin Reservoir, December 1950. U.S. Marine Corps — public domain · source
Marines move out of Koto-ri
Marines move out of Koto-ri Marines move out of Koto-ri on 8 December 1950 to attack south toward Funchilin Pass. U.S. Marine Corps (via Flickr) — CC BY 2.0 · source
Treadway bridge at Funchilin Pass
Treadway bridge at Funchilin Pass The air-dropped Treadway bridge in place over the gap beside the penstocks, 9 December 1950. U.S. Marine Corps, National Archives — public domain · source
The penstocks and the blown bridge
The penstocks and the blown bridge Aerial view of the reservoir penstocks in Funchilin Pass, with the blown bridge that blocked the road south. U.S. Marine Corps — public domain · source

Sources and method

Chosin Reservoir, 27 November – 13 December 1950. Places from Pacific Wrecks (Hagaru-ri, Yudam-ni, Kot'o-ri, Hamhung, Hungnam), Wikipedia (Changjin Air Force Base, on the site of the 1950 Hagaru-ri airstrip; Lake Changjin). Toktong Pass, Hudong-ni, Hill 1221, the Pungnyuri inlet perimeter, Hell Fire Valley, the Funchilin Pass bridge site, Hill 1081 and Chinhung-ni are placed approximately from road distances in the histories, and unit positions are schematic at regiment/battalion level. Events and numbers follow Lynn Montross and Capt. Nicholas Canzona, U.S. Marine Operations in Korea 1950–1953, Vol. III: The Chosin Reservoir Campaign (USMC Historical Branch, 1957) and its maps; Billy C. Mossman, Ebb and Flow, November 1950 – July 1951 (US Army Center of Military History, 1990); Roy E. Appleman, East of Chosin (1987); George A. Rasula, The Chosin Chronology; and the Wikipedia articles on the battle and on Task Force Faith. Chinese strengths and losses are disputed; figures are given as the sources state them. Images from Wikimedia Commons.

Where the positions come from

Approximate locations