Hungnam evacuation

In deciding how to evacuate his forces and still successfully defend his perimeter, Almond considered two alternatives. He could place all divisions on the perimeter and then withdraw portions of each simultaneously, or he could pull out one division at a time and spread his remaining forces to cover the vacated sector on a shorter front. Since some units were more battle worn than others, especially the 1st Marine Division, he elected the latter method and intended to ship the Marines first. They were to be followed by the 7th Division, then the 3rd Division. Almond planned to phase out ROK I Corps, X Corps' support units, bulk supplies and heavy equipment simultaneously with the US Army divisions. This was to be done carefully enough to keep a proper balance between combat and support troops and to ensure adequate logistical support. To maintain this balance yet guarantee that the evacuation proceeded as rapidly as possible, he established three points of control. From X Corps headquarters, his G-3 and G-4 together guided the dispatch of units to the beach. To supervise the actual loading of troops and materiel at water's edge, he organized a control group under Col. Edward H. Forney, a Marine officer serving as Almond's deputy chief of staff. Under Colonel Forney's direction, the 2nd Engineer Special Brigade was to operate dock facilities, a reinforced Marine shore party company was to operate the LST and small craft beaches and control the lighterage for ships to be loaded in the harbor anchorages, and some five thousand Korean civilians were to work as stevedores. On the Navy's end of the out-loading procedure, Admiral Doyle, through a control unit aboard his flagship USS Mount McKinley, was to coordinate all shipments, assign anchorages, and issue docking and sailing instructions. Direct liaison was established between Almond's control group ashore and Doyle's control group at sea to match outgoing troops, supplies, and equipment with available ships. Almond also dispatched a control group under Lt. Col. Arthur M. Murray from Corps' headquarters to Pusan to receive troops, supplies, and equipment arriving by sea and air and to move them as rapidly as possible to assembly areas. Including the troops and materiel outloaded at Wonsan and Songjin, Almond needed shipping space for 105,000 troops, 18,422 vehicles, and some 350,000 tons of bulk cargo. Although Admiral Doyle commanded a transport group of over 125 ships, some would have to make more than one trip to meet Almond's needs. The Far East Air Forces’ Combat Cargo Command flying out of Yonpo Airfield was to fulfill airlift requirements. Tactical air support during the evacuation would be a Navy and Marine responsibility, the Fifth Air Force fighters previously located in northeastern Korea having flown out to Pusan on 3 December. The 1st Marine Air Wing, based at Yonpo and aboard escort carriers, was to devote its full effort to supporting the corps operation. In addition, Admiral Doyle was to arrange both naval air and naval gunfire support. Reinforced by ships supplied by Admiral Arthur Dewey Struble, the Seventh Fleet commander, Doyle eventually was able to employ seven carriers in throwing a canopy of aircraft over the Corps area and to deploy one battleship, two cruisers, seven destroyers, and three rocket ships in a maneuver area reaching 10 miles (16 km) north and south of Hungnam to answer Almond’s requests for gunfire support.[1]^:166–8

Map of X Corps' evacuation phase lines

To begin an orderly contraction of defenses as X Corps’ strength ashore diminished, the units on the perimeter were to withdraw deliberately as the 1st Marine Division embarked toward the first of three phase lines that Almond drew around Hungnam. In the southwest this first line rested generally along the Yowi-ch’on River, just below Yonpo Airfield and elsewhere traced an arc about 3 miles (4.8 km) from the heart of Hungnam. The second line differed from the first only in the southwest in the US 3rd Division sector where it followed the upper bank of the Songch’on River close by Hungnam. The 3rd Division's withdrawal to this second line, which would mean the abandonment of Yonpo Airfield, was scheduled to take place as the US 7th Division began its embarkation. The third and final line was a tight arc about 1 mile (1.6 km) outside the limits of Hungnam to be occupied by the 3rd Division as that division itself prepared to outload. During this final phase of the evacuation 3rd Division units were to use rearguard tactics to cover their own embarkation.[1]^:168–9

General Almond published his formal evacuation order on 11 December, the date on which General MacArthur visited Korea and flew into Yonpo Airfield for a conference with him. After briefing MacArthur on Corps' dispositions and the plan of evacuation, Almond predicted that the evacuation would be orderly, that no supplies or equipment would be destroyed or abandoned and that PVA/KPA forces would not interfere seriously. The redeployment of X Corps to southern Korea, he estimated, would be complete by 27 December.[1]^:169

Refugees aboard a US ship

The 1st Marine Division, as it came into Hungnam from the Chosin Reservoir on 11 December, assembled between the port and Yonpo Airfield. The division loaded over the following three days and sailed for Pusan at mid-morning on the 15th. General Almond the day before had designated Masan, 30 miles (48 km) west of Pusan, as the division's assembly area. Following the voyage to Pusan and a motor march to Masan, the Marines passed to Eighth Army control on 18 December. Some bulk cargo was shipped out during the Marine loading, but the heavier evacuation of material began after the Marines sailed. From 15 December onwards service units gradually moved depots and supply points into the port area proper and the bulk supplies and heavy equipment were either loaded aboard ships double-banked at the docks or lightered to ships in the harbor. To save time, ammunition was loaded at the docks instead of well out into open water according to usual precautionary practice. This constant outward flow of material paralleled unit embarkations through the final day of the evacuation.[1]^:169–70

While the Marines departed by sea, the bulk of the 1st Korean Marine Corps Regiment, which had been attached to the 3rd Division, moved to Yonpo for evacuation by air. 3rd Division commander General Robert H. Soule had planned to compensate for the loss of the South Korean marines by pulling his division to the shorter first phase line on 16 December, but several sharp attacks against his positions between Chigyong and Oro-ri during the morning of the 15th prompted him to make his withdrawal that afternoon. By the 16th the attacks against the 3rd Division on the western and northwestern arcs of the perimeter, enemy patrols engaged ROK I Corps in the northeast, and other ground and air reports indicated that PVA/KPA forces were closing in around the X Corps perimeter but not in great strength. Parts of the PVA 81st Division, 27th Army, appeared to have made the attacks on the 3rd Division and a KPA brigade apparently was moving toward Hungnam over the coastal road from the northeast. A greater immediate problem than the approach of relatively few enemy forces was a mass movement of civilians toward the corps perimeter. Although General Almond had planned to evacuate government officials, their families and as many others as shipping space allowed, he had not anticipated that thousands of civilians would try to reach Hungnam. Besides hampering evacuation operations by overcrowding the port area, the large refugee movement posed a danger of PVA/KPA infiltration. According to Corps' intelligence sources, the North Koreans were circulating a rumor in Hamhung that X Corps would provide transportation for all civilians who wished to leave North Korea. The intention was to create a mass move to cover the infiltration of KPA agents and saboteurs. To prevent overcrowding and infiltration, military police, intelligence agents, and perimeter troops attempted to block civilian entry, particularly over the Hamhung-Hungnam road, which carried the larger number of refugees. They were only partially successful. Those civilians already in Hungnam and those who managed to reach the city were screened, then moved to the southeastern suburb of Sohojin, where Corps' civil affairs personnel distributed food and organized them for evacuation as shipping space became available.[1]^:170–1

On the heels of the Marine division, the US 7th Division began to load on 14 December, embarking first the worn troops of the 31st Infantry Regiment, 1st Battalion, 32nd Infantry Regiment and the 57th Field Artillery Battalion, who had been with the Marines in the Chosin Reservoir area. Most of the 7th Division's service units went aboard ship on the 15th and 16th. The US 17th Infantry Regiment and remainder of the 32nd Infantry Regiment meanwhile relieved ROK I Corps on the perimeter and withdrew to the first phase line. Hence, the Corps' perimeter on the 16th was divided into two nearly equal parts by the Songch’on River, the 7th Division in position above it, the 3rd Division holding the sector below. Patrols and outposts deepened the defense as far out as the lower edge of Hamhung.[1]^:171

After being relieved by the 7th Division, ROK I Corps loaded and sailed at noon on 17 December. Although original plans called for the ROK to go to Pusan, General MacArthur, apparently as a result of his 11 December visit to Korea, had directed that the Corps' units then on the Hungnam perimeter be sea lifted to Samch’ok. These units and those being carried to Pusan from Songjin were to pass to Eighth Army control upon disembarkation. This transfer would permit Eighth Army commander General Walton Walker to deploy ROK I Corps immediately, and the landing at Samch’ok would put much of it close at hand for deployment at the eastern end of his proposed Line B. The landing, actually made at a small port just north of Samch’ok, was completed on 20 December. ROK I Corps’ departure on the 17th coincided with the evacuation of most X Corps' headquarters sections and troops. Their final destination was Kyongju, 50 miles (80 km) north of Pusan, where they were to establish an advance Corps' command post. On the same day, operations at Yonpo Airfield closed as the left flank units of the 3rd Division prepared to withdraw to the lower bank of the Songch’on River behind the field the next day. The Marine squadrons that had used the field already had withdrawn to Pusan and Itami Air Base, Japan. Last to leave was a Fifth Air Force base unit that had serviced the Marine fighters and General William H. Tunner’s cargo aircraft. By the closing date Tunner's planes had lifted out 3,600 troops, 196 vehicles, 1,300 tons of cargo, and several hundred refugees.[1]^:171–2

The 18 December withdrawal of General Soule's left flank units to the lower bank of the Songch’on River was a preliminary move in the 3rd Division's relief of the two 7th Division regiments still on the perimeter. Soule's forces stepped behind the Songch’on to the second Corps' phase line on the 19th and on the 19th and 20th spread out to relieve the 17th and 32nd Regiments. General Almond closed his command post in Hungnam on the 20th and reopened it aboard USS Mount McKinley in the harbor, leaving General Soule in command of ground troops ashore. PVA/KPA probing attacks, which had slackened noticeably after the 3rd and 7th Divisions withdrew to the first Corps' phase line, picked up again on the 18th and became still more intense on the following day. Three PVA divisions, the 79th, 80th and 81st, all from the 27th Army, were believed to be in the nearby ground west of Hungnam, although only the 79th was currently in contact. North and northeast of Hungnam, a KPA brigade and the reconstituted KPA 3rd Division had been encountered, as had another KPA force, presumably a regiment. None of the PVA/KPA strikes on the perimeter did more than penetrate someoutposts, and counterattacks rapidly eliminated these gains. So far, all action appeared to be only an attempt to reconnoiter the perimeter. Several explanations for the PVA/KPA's failure to make a larger effort were plausible. The bulk of the PVA in the Chosin Reservoir area apparently were taking time to recuperate from losses suffered in the cold weather and recent battles. All PVA/KPA forces undoubtedly were aware that X Corps was evacuating Hungnam and that they would be able to enter the city soon without having to fight their way in. The contraction of the Corps' perimeter probably forced the PVA/KPA to repeat their reconnaissance. Artillery fire, naval gunfire, and ample close air support may well have prevented the PVA/KPA from concentrating sufficient strength for strong attacks. Whatever the reasons, PVA/KPA forces had not yet launched a large-scale assault. Although an additional unit, a regiment of the KPA 1st Division, was identified near the northeastern anchor of the Corps' perimeter on 20 December, PVA/KPA attacks diminished on the 20th and 21st as the last troops of the 7th Division embarked and sailed for Pusan. 7th Division completed their redeployment on the 27th and moved into an assembly around Yongch’on, west of the new X Corps headquarters at Kyongju. New but still small attacks harassed the 3rd Division on 22 December as General Soule's 7th, 65th and 15th Infantry Regiments from west to east stood at the second Corps' phase line to cover the loading of the last Corps' artillery units and the first of the division's service units. On the 23rd, when Soule pulled his regiments to the last Corps' phase line in preparation for the final withdrawal from Hungnam, only a small amount of mortar and artillery fire struck the perimeter troops. Whatever conditions so far had kept the PVA/KPA from opening a large assault continued even after the X Corps’ perimeter strength dwindled to a single division. The indirect fire received on the 23rd proved to be the last opposition offered.[1]^:172–3

By morning of the 24th the perimeter was silent and remained so as the last of the 3rd Division's service units loaded and as General Soule started his rearguard action to take out his regiments and artillery. A battalion from each regiment stayed on the perimeter while the remaining infantry and the artillery outloaded and while the Division's 10th Engineer Combat Battalion and Navy underwater demolition teams prepared port facilities for destruction. At the same time, the last Corps' supplies, the port operating units, and as many of the remaining refugees as possible were put aboard ship. After General Almond made a final inspection ashore, seven platoons established strongpoints near the beaches to protect the embarkation of the remainder of the covering battalions and the bulk of the 10th Engineer Combat Battalion. In the final steps, Admiral Doyle's warships laid down a wide barrage about 1.5 miles (2.4 km) inland as the last platoons of the covering force loaded and as the 10th Engineer Combat Battalion and Navy demolition teams blew up the port before leaving the beaches aboard LVTs and LCMs shortly after 14:30.[1]^:173–4

By Christmas Eve the ships carrying the last X Corps troops and supplies were well out of Hungnam harbor en route to Pusan and Ulsan, a small port 30 miles (48 km) north of Pusan. They left behind no serviceable equipment or usable supplies. About 200 tons of ammunition, a similar amount of frozen dynamite, 500 thousand-pound aerial bombs and about 200 drums of oil and gasoline had not been taken out, but all of this [had] added to the loudness of the final blowup of the port of Hungnam."[1]^:174