Editing Battle of Chosin Reservoir (section)

===Actions at Hagaru-ri===
[[File:Dasc at hagaru ri.jpg|thumb|alt=A group of tents surrounded by grass|A [[Direct Air Support Center]] at Hagaru-ri]]
To support the Marine attack towards Mupyong-ni, Hagaru-ri became an important supply dump with an airfield under construction. Smith and 1st Marine Division headquarters were also located at Hagaru-ri.{{sfn|Appleman|1990|p=72}} With the bulk of the 1st Marine Division gathered at Yudam-ni, Hagaru-ri was lightly defended by two battalions from the 1st and 7th Marines, the rest of the garrison being composed of engineers and rear support units from both the Army and the Marine Corps.{{sfn|Alexander|1986|p= 322}}

The original Chinese plan called for the 58th Division to attack Hagaru-ri on the night of 27 November, but the division became lost in the countryside due to the outdated Japanese maps it used.{{sfn|Guang|2007|p=74}} It was not until the dawn of 28 November that the 58th Division arrived at Hagaru-ri.{{sfn|Guang|2007|p=74}} Meanwhile, from the fighting and ambushes that had occurred the previous night, the garrison at Hagaru-ri noticed the Chinese forces around them. Lieutenant Colonel Thomas L. Ridge, commander of [[3rd Battalion, 1st Marines]] (3/1), predicted the Chinese attack would come on the night of 28 November.{{sfn|Appleman|1990|p=162}} Almost everyone, including rear support units with little combat training, was pressed into service on the front line due to the manpower shortage,{{sfn|Appleman|1990|p=174}} and the entire perimeter was on full alert by 21:30.{{sfn|Appleman|1990|p=163}}

It was not long before the PVA 173rd Regiment attacked the western and the southern perimeter, while the 172nd Regiment struck the hills on the northern perimeter.{{sfn|Roe|2000|p=317}} Despite the preparations, the understrength garrison was overwhelmed, with the Chinese opening several gaps in the defenses and reaching the rear areas.{{sfn|Appleman|1990|p=165}} The resulting chaos, however, caused a breakdown in discipline among the Chinese soldiers, who began looting food and clothing instead of exploiting the situation.{{sfn|Alexander|1986|p= 324}} The defending Americans managed to destroy the Chinese forces in counterattacks, while a breakdown of communications between the Chinese regiments allowed the gaps to close.{{sfn|Appleman|1990|p=174}} When the fighting stopped, the Chinese had only gained the East Hill ({{Coord|40.387|N|127.259|E|display=inline}}) on the northern perimeter.{{sfn|Appleman|1990|p=174}} Another attack was planned for the night of 29 November, but air raids by [[VMA-542|VMF-542]] broke up the Chinese formations before it could be carried out.{{sfn|Appleman|1990|p=195}}

[[File:Evacuation of wounded Marines during the Korean War.jpg|thumb|alt=A wounded man is carried by soldiers onto a helicopter|Wounded Marine being evacuated by a [[Sikorsky H-5|HO3S-1]] helicopter from [[VMO-6]]]]
Given the critical manpower shortage at Hagaru-ri, on 29 November, Smith ordered Colonel [[Chesty Puller|Lewis "Chesty" Puller]] of the [[First Marine Regiment]] to assemble a task force to be sent north from Kot'o-ri to open the road south of Hagaru-ri.{{sfn|Appleman|1990|p=186}}{{sfn|Hickman}} A task force was formed with 921 troops from 41 (Royal Marine) Commando, G Company of the 1st Marines and B Company of the 31st Infantry.{{sfn|Appleman|1990|p=187}}{{sfn|Montross|Canzona|1992|pp=228, 234}} It was dubbed "Task Force Drysdale" after its commander, Lieutenant Colonel Douglas B. Drysdale, who also commanded 41 Commando.{{sfn|Appleman|1990|p=187}} 

On the afternoon of 29 November, Task Force Drysdale pushed north from Koto-ri, while under constant attack from the PVA 60th Division.{{sfn|Guang|2007|p=78}}{{sfn|Appleman|1990|p=189}} The task force's harrowing experience later earned the road the nickname "Hell Fire Valley".{{sfn|Appleman|1990|p=193}} As the Chinese attacks dragged on, the task force became disorganized,{{sfn|Appleman|1990|p=191}} and a destroyed truck in the convoy later split the task force into two segments.{{sfn|Appleman|1990|p=192}} Although the lead segment fought its way into Hagaru-ri on the night of 29 November, the rear segment was destroyed.{{sfn|Alexander|1986|p= 327}} Despite suffering 162 dead and missing and 159 wounded, the task force managed to bring in 300 badly needed infantrymen for the defense at Hagaru-ri.{{sfn|Montross|Canzona|1992|pp=228, 234}}{{sfn|Appleman|1990|p=201}}

As more reinforcements arrived from Hudong-ni on 30 November,{{sfn|Appleman|1990|p=204}} the garrisons attempted to recapture the East Hill. All efforts failed, despite the destruction of a Chinese company.{{sfn|Guang|2007|p=80}}{{sfn|Appleman|1990|p=203}} When darkness settled, the PVA 58th Division gathered its remaining 1,500 soldiers in a last-ditch attempt to capture Hagaru-ri.{{sfn|Guang|2007|p=81}} The reinforced defenders annihilated most of the attacking forces, with only the defences around the East Hill giving way.{{sfn|Appleman|1990|p=205}} As the Chinese tried to advance from the East Hill, they were cut down by the 31st Tank Company.{{sfn|Appleman|1990|p=206}}

By 1 December, the PVA 58th Division was virtually destroyed,{{sfn|Roe|2000|p=340}} with the remainder waiting for reinforcements from the 26th Army of the 9th Corps.{{sfn|Guang|2007|p=97}}{{sfn|Appleman|1990|p=251}} Much to the frustration of Song Shilun, the 26th Corps did not arrive before the Marines broke out of Yudam-ni.{{sfn|Xue & Li Part Four|2000}} The airfield was opened to traffic on 1 December, allowing UN forces to bring in reinforcements and to evacuate the dead and wounded.{{sfn|Appleman|1990|p=208}} With the Marines at Yudam-ni completing their withdrawal on 4 December, the trapped UN forces could finally start their breakout towards the port of Hungnam.