The Battle of Khe Sanh (21 January – 9 July 1968) was conducted in the Khe Sanh area of northwestern Quảng Trị Province, Republic of Vietnam (South Vietnam), during the Vietnam War. The main forces defending Khe Sanh Combat Base (KSCB) were a regiment of the United States Marine Corps and a battalion of Army of the Republic of Vietnam (ARVN) troops. These were pitted against two to three divisional-size elements of the North Vietnamese People's Army of Vietnam (PAVN).
The US command in Saigon initially believed that combat operations around KSCB during 1967 were part of a series of minor PAVN offensives in the border regions, but when the PAVN was found to be moving major forces into the area, the U.S. force at KSCB was reinforced. On 21 January 1968, the PAVN surrounded and besieged the Marine base. In the ensuing five months, KSCB and the hilltop outposts around it were subjected to daily PAVN artillery, mortar, and rocket attacks, and several infantry assaults. More than 274 U.S. troops were killed and more than 2,500 wounded.
To support the Marine base, the USAF undertook Operation Niagara, a massive aerial bombardment campaign. In the first three months, over 114,810 tons of bombs were dropped by US and allied aircraft and over 158,900 artillery rounds were fired in defense of the base. US forces lost one KC-130, three C-123 and 35 helicopters, while another 23 aircraft and 123 helicopters were damaged. Throughout the campaign, US forces used the latest technology to locate and target PAVN forces, and logistical innovations to support the base.
In March 1968, a combined Marine–Army/ARVN task force launched an overland relief expedition (Operation Pegasus) that eventually broke through to the Marines at Khe Sanh.
American commanders considered the defense of Khe Sanh a success, but shortly after the siege was lifted, decided to abandon the base rather than risk similar battles in the future. On 19 June 1968, the evacuation and destruction of KSCB began. Amid heavy shelling, the Marines attempted to salvage what they could before destroying what remained as they were evacuated. Minor attacks continued before the base was officially closed on 5 July. Marines remained around Hill 689, though, and fighting in the vicinity continued until 11 July until they were finally withdrawn, bringing the battle to a close.
In the aftermath, the North Vietnamese proclaimed a victory at Khe Sanh, while US forces claimed that they had withdrawn, as the base was no longer required. Historians have observed that the Battle of Khe Sanh may have distracted American and South Vietnamese attention from the buildup of Viet Cong (VC) forces in the south before the early 1968 Tet Offensive. Nevertheless, the US commander during the battle, General William Westmoreland, maintained that the true intention of Tet was to distract forces from Khe Sanh.
Prelude
The village of Khe Sanh was the seat of government of Hương Hoa district, an area of Bru Montagnard villages and coffee plantations about 7 miles (11 km) from the Laotian frontier on Route 9, the northernmost transverse road in South Vietnam. The badly-deteriorated Route 9 ran from the coastal region through the western highlands and crossed the border into Laos. The origin of the combat base lay in the construction by US Army Special Forces of an airfield in August 1962 outside the village at an old French fort. The camp then became a Special Forces outpost of the Civilian Irregular Defense Groups, which were to keep watch on PAVN infiltration along the border and to protect the local population.
James Marino wrote that in 1964, General William Westmoreland, the US commander in Vietnam, had determined, "Khe Sanh could serve as a patrol base blocking enemy infiltration from Laos; a base for... operations to harass the enemy in Laos; an airstrip for reconnaissance to survey the Ho Chi Minh Trail; a western anchor for the defenses south of the DMZ; and an eventual jumping-off point for ground operations to cut the Ho Chi Minh Trail." In November 1964, the Special Forces moved their camp to the Xom Cham Plateau, the future site of Khe Sanh Combat Base.
In the winter of 1964, Khe Sanh became the location of a launch site for the highly classified Military Assistance Command, Vietnam – Studies and Observations Group. The site was first established near the village and later moved to the French fort. From there, reconnaissance teams were launched into Laos to explore and gather intelligence on the PAVN logistical system known as the Ho Chi Minh Trail, also known as "Truong Son Strategic Supply Route" to the North Vietnamese soldiers.
Marino stated that "by 1966, Westmoreland had begun to consider Khe Sanh as part of a larger strategy." With a view to gain the eventual approval for an advance through Laos to interdict the Ho Chi Minh Trail, he determined that "it was absolutely essential to hold the base." He gave the order for US Marines to take up positions around Khe Sanh. Military Assistance Command, Vietnam, then began planning for incursion into Laos, and in October, the construction of an airfield at Khe Sanh was completed.
The plateau camp was permanently manned by the US Marines in 1967, when they established an outpost next to the airstrip. This base was to serve as the western anchor of Marine Corps forces, which had tactical responsibility for the five northernmost provinces of South Vietnam known as I Corps. The Marines' defensive system stretched below the Demilitarized Zone (DMZ) from the coast, along Route 9, to Khe Sanh. In 1966, the regular Special Forces troops had moved off the plateau and built a smaller camp down Route 9 at Lang Vei, about half the distance to the Laotian border.
Background
Border battles
During the second half of 1967, the North Vietnamese instigated a series of actions in the border regions of South Vietnam. All of the attacks were conducted by regimental-size PAVN/VC units, but unlike most of the previous usual hit-and-run tactics, they were sustained and bloody affairs.
In early October, the PAVN had intensified battalion-sized ground probes and sustained artillery fire against Con Thien, a hilltop stronghold in the center of the Marines' defensive line south of the DMZ, in northern Quảng Trị Province. Mortar rounds, artillery shells, and 122 mm rockets fell randomly but incessantly upon the base. The September bombardments ranged from 100 to 150 rounds per day, with a maximum on 25 September of 1,190 rounds.
Westmoreland responded by launching Operation Neutralize, an aerial and naval bombardment campaign designed to break the siege. For seven weeks, American aircraft dropped between 35,000 and 40,000 tons of bombs in nearly 4,000 airstrikes.
On 27 October, a PAVN regiment attacked an Army of the Republic of Vietnam (ARVN) battalion at Song Be, capital of Phước Long Province. The PAVN fought for several days, took casualties, and fell back. Two days later, the PAVN 273rd Regiment attacked a Special Forces camp near the border town of Loc Ninh, in Bình Long Province. Troops of the US 1st Infantry Division were able to respond quickly. After a ten-day battle, the attackers were pushed back into Cambodia. At least 852 PAVN soldiers were killed during the action, as opposed to 50 American and South Vietnamese.
The heaviest action took place near Dak To, in the Central Highlands province of Kon Tum. The presence of the PAVN 1st Division prompted a 22-day battle there and had some of the most intense close-quarters fighting of the entire conflict. US intelligence estimated between 1,200 and 1,600 PAVN troops were killed, and 362 members of the US 4th Infantry Division, the 173rd Airborne Brigade, and ARVN Airborne elements were killed in action, but three of the four battalions of the 4th Infantry and the entire 173rd were rendered combat-ineffective during the battle.
American intelligence analysts were quite baffled by the series of enemy actions. No logic was apparent to them behind the sustained PAVN/VC offensives other than to inflict casualties on the allied forces. That was accomplished, but the casualties absorbed by the North Vietnamese seemed to negate any direct gains they might have obtained. The border battles, however, had two significant consequences, which were unappreciated at the time. They fixed the attention of the American command on the border regions, and they drew American and ARVN forces away from the coastal lowlands and cities in preparation for the Tet Offensive.
Hill fights
Things remained quiet in the Khe Sanh area through 1966. Even so, Westmoreland insisted for it not only to be occupied by the Marines but also for it to be reinforced. He was vociferously opposed by General Lewis W. Walt, the Marine commander of I Corps, who argued heatedly that the real target of the American effort should be the pacification and protection of the population, not chasing the PAVN/VC in the hinterlands.
Westmoreland won out, however, and the 1st Battalion, 3rd Marine Regiment (1/3 Marines) was dispatched to occupy the camp and airstrip on 29 September. By late January 1967, the 1/3 returned to Japan and was relieved by Bravo Company, 1st Battalion, 9th Marines (1/9 Marines). A single company replaced an entire battalion.
On 24 April 1967, a patrol from Bravo Company became engaged with a PAVN force of an unknown size north of Hill 861. That action prematurely triggered a PAVN offensive aimed at taking Khe Sanh. The PAVN forces were in the process of gaining elevated terrain before it launched the main attack. The 2nd and 3rd battalions of the 3rd Marine Regiment, under the command of Colonel John P. Lanigan, reinforced KSCB and were given the task of pushing the PAVN off of Hills 861, 881 North, and 881 South. PAVN forces were driven out of the area around Khe Sanh after suffering 940 casualties. The Marines suffered 155 killed in action and 425 wounded.
To prevent PAVN observation of the main base at the airfield and their possible use as firebases, the hills of the surrounding Khe Sanh Valley had to be continuously occupied and defended by separate Marine elements.
In the wake of the hill fights, a lull in PAVN activity occurred around Khe Sanh. By the end of May, Marine forces were again drawn down from two battalions to one, the 1st Battalion, 26th Marines. Lieutenant General Robert E. Cushman Jr. relieved Walt as commander of III MAF in June.
On 14 August, Colonel David E. Lownds took over as commander of the 26th Marine Regiment. Sporadic actions were taken in the vicinity during the late summer and early fall, the most serious of which was the ambush of a supply convoy on Route 9. That proved to be the last overland attempt at resupply for Khe Sanh until the following March. In December and early January, numerous sightings of PAVN troops and activities were made in the Khe Sanh area, but the sector remained relatively quiet.
Decisions
A decision then had to be made by the American high command to commit more of the limited manpower in I Corps to the defense of Khe Sanh or to abandon the base. Westmoreland regarded the choice as quite simple. In his memoirs, he listed the reasons for a continued effort:
Khe Sanh could serve as a patrol base for blocking enemy infiltration from Laos along Route 9; as a base for SOG operations to harass the enemy in Laos; as an airstrip for reconnaissance planes surveying the Ho Chi Minh Trail; as the western anchor for defenses south of the DMZ; and as an eventual jump-off point for ground operations to cut the Ho Chi Minh Trail.
Not all leading Marine officers, however, had the same opinion. Cushman, the new III MAF commander, supported Westmoreland perhaps because he wanted to mend Army/Marine relations after the departure of Walt. Other concerns raised included the assertion that the real danger to I Corps was from a direct threat to Quảng Trị City and other urban areas, a defense would be pointless as a threat to infiltration since PAVN troops could easily bypass Khe Sanh, the base was too isolated, and the Marines "had neither the helicopter resources, the troops, nor the logistical bases for such operations." Additionally, Shore argued that the "weather was another critical factor because the poor visibility and low overcasts attendant to the monsoon season made such operations hazardous."
Brigadier General Lowell English (assistant commander 3rd Marine Division) complained that the defense of the isolated outpost was ludicrous: "When you're at Khe Sanh, you're not really anywhere. You could lose it and you really haven't lost a damn thing."
As far as Westmoreland was concerned, however, all that he needed to know was that the PAVN had massed large numbers of troops for a set-piece battle. Making the prospect even more enticing was that the base was in an unpopulated area in which American firepower could be fully employed without civilian casualties. The opportunity to engage and destroy a formerly elusive enemy that was moving toward a fixed position promised a victory of unprecedented proportions.
Battle
Attacks on the perimeter
First skirmishes
In early December 1967, the PAVN appointed Major General Trần Quý Hai as the local commander for the actions around Khe Sanh, with Lê Quang Đạo as his political commissar. In the coming days, a campaign headquarters was established around Sap Lit. Two divisions, the 304th and the 325th, were assigned to the operation: the 325th was given responsibility for the area around the north, while the 304th was given responsibility for the southern sector. In attempting to determine PAVN intentions Marine intelligence confirmed that, within a period of just over a week, the 325th Division had moved into the vicinity of the base and two more divisions were within supporting distance. The 324th Division was located in the DMZ area 10–15 miles (16–24 km) north of Khe Sanh while the 320th Division was within easy reinforcing distance to the northeast. They were supported logistically from the nearby Ho Chi Minh Trail. As a result of this intelligence, KSCB was reinforced on 22 January 1968 by the 1st Battalion, 9th Marine Regiment. According to the official PAVN history, by December 1967 the North Vietnamese had in place, or within supporting distance: the 304th, 320th, 324th and 325th Infantry Divisions, the independent 270th infantry Regiment; five artillery regiments (the 16th, 45th, 84th, 204th, and 675th); three AAA regiments (the 208th, 214th, and 228th); four tank companies; one engineer regiment plus one independent engineer battalion; one signal battalion; and a number of local force units.