From 21 January to 8 April 1968 about 6,000 U.S. Marines, with ARVN Rangers, Special Forces-led troops and Bru irregulars, held Khe Sanh Combat Base and its hill outposts in north-western South Vietnam against two or more North Vietnamese divisions, put at 15,000–20,000 men at the time and up to about 30,000 in later estimates. Cut off by road, the garrison was kept alive by air supply and protected by one of the heaviest bombing campaigns in history, Operation Niagara. The NVA took Khe Sanh village and overran the Lang Vei Special Forces camp with tanks, but every Marine hill and the main perimeter held until Operation Pegasus reopened Route 9. Losses are disputed. The Marine history gives 205 Marines killed in Operation Scotland up to 31 March; counts that include the hill fights, Lang Vei, aircrew and Pegasus are several times higher. MACV estimated 10,000–15,000 NVA dead, while Vietnamese sources give about 2,500. Historians still argue over whether Hanoi meant to take the base as a second Dien Bien Phu or used it to draw U.S. forces away from the cities before Tet.
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Khe Sanh Combat Base sits on a plateau in north-western Quang Tri Province, about 25 km south of the DMZ and 16 km from Laos, at the end of a single road, Route 9. By January 1968 the 26th Marines (Col. David E. Lownds) hold the base and its airstrip with 1st Battalion and L/3/26, a Special Forces-led SOG unit (FOB-3), and the guns of 1/13. Companies sit on the hills that command the approaches: I and M/3/26 on Hill 881 South, K/3/26 on 861, E/2/26 on 861A, 2/26 on 558 across the Rao Quan valley, and a platoon guarding the radio relay on Hill 950. A Combined Action platoon and an RF company hold Khe Sanh village; Special Forces and CIDG troops hold Lang Vei on Route 9. On 20 January I/3/26 fights a sharp action on the ridges toward Hill 881 North. U.S. intelligence places two NVA divisions close by, the 325C to the north and north-west and the 304th to the south-west. Where the NVA regiments actually stood is only roughly known.
Just after midnight, a mortar barrage is followed by an assault on Hill 861 by about 300 NVA. Sappers breach the wire and part of K/3/26's perimeter near the landing zone is penetrated before a counterattack seals it; 4 Marines are killed and 47 NVA bodies are counted. At 05:30 hundreds of mortar, artillery and 122mm rocket rounds fall on the base. One hits the main ammunition dump (ASP-1) near the east end of the runway: by one count more than 1,500 tons explode, about 98 percent of the stock, and fires burn for some 48 hours. Only part of the runway stays usable. At dawn the 66th Regiment of the 304th Division attacks Khe Sanh village; the defenders hold, but relief attempts fail, a helicopter carrying RF troops and U.S. aircrew is lost, and on 22 January Lownds evacuates the village.
Reinforcements have arrived: 1/9 Marines (22 January), dug in around the rock quarry about 1,500 m west-south-west of the base with a platoon on a knoll beyond it (Alpha-1), and the 37th ARVN Ranger Battalion (27 January), dug in at the east end of the runway just outside 1/26's lines. Sensors dropped around the base pick up large movements on 3–4 February. In the early hours of 5 February sappers and about 200 NVA hit E/2/26 on Hill 861A, break through the wire and get into the trenches; the Marines throw them out at close quarters, supported by mortars from 861 and 881 South. E Company loses 7 killed and 24 wounded; over 100 NVA dead are reported.
Shortly after midnight on 7 February NVA tanks appear for the first time in the war in the South. PT-76s of the 203rd Armored Regiment (accounts give 11 to 14 tanks) and the 24th Regiment of the 304th Division, with sappers and flamethrowers, break into the Lang Vei camp. The 24 Special Forces men and about 500 CIDG troops destroy several tanks with recoilless rifles and LAWs, but the camp is overrun; a survivor group holds out in the command bunker. Lownds, fearing an ambush on the road, does not send ground relief. Sgt. 1st Class Eugene Ashley Jr. leads Laotian troops from the old camp in repeated counterattacks and is killed (Medal of Honor). Marine helicopters lift the survivors out on 7 February. By the official count about 300 of 487 defenders are killed, wounded or missing, including 10 Americans.
At 04:15 on 8 February a battalion of the 101D Regiment attacks the 1/9 platoon on Alpha-1 and overruns part of it. A relief force from the quarry, led by Capt. Henry J. M. Radcliffe, clears the knoll by late morning. The Marines lose 24 killed and 27 wounded; more than 150 NVA bodies are reported (Nalty gives 21 Marines and at least 124 NVA). Through February the NVA dig approach trenches toward the base, by one report to within 25–35 m of the wire, as in a classic siege. On 23 February about 1,300 rounds hit the base, the heaviest day of shelling. On 25 February a B/1/26 platoon patrolling south of the perimeter is ambushed: by the official count 6 killed, 17 wounded and 25 missing.
On the night of 29 February (some accounts say 28 February) a battalion of the 66th Regiment moves through its trenches against the 37th ARVN Rangers at the east end. Sensors and listening posts give warning, and the attack meets massed artillery, radar-directed bombing and the Rangers' fire. Three successive waves fail to reach the trenches; 7 NVA bodies are found in the wire and 71 more beyond it, for one Ranger wounded, by the Marine history's count. It is the largest ground attack on the main perimeter during the siege; later probes in March are smaller.
The garrison lives on air supply. C-130s and C-123s land under fire or drop loads by parachute and low-level extraction (LAPES and GPES); Marine helicopters supply the hills, flying from late February in 'Super Gaggles' of CH-46s with A-4 Skyhawks laying smoke and suppressing guns, a system credited with cutting helicopter losses to very few. Operation Niagara, 22 January to 31 March, puts in roughly 24,000 tactical sorties and 2,500 B-52 sorties, over 95,000 tons of ordnance by one count, with B-52 strikes as close as about 1 km to the wire. On 6 March a C-123 is shot down on approach with 48 aboard. By mid-March the 325C Division is reported moving back toward Laos and the 304th withdrawing south-west, though shelling goes on; on 30 March B/1/26 raids the position where its patrol was ambushed.
On 1 April two battalions of the 1st Marines attack west from Ca Lu along Route 9 while the 1st Cavalry Division (Airmobile) leapfrogs ahead of them by helicopter from LZ Stud, its 3rd Brigade landing at LZ Mike, then the 2nd Brigade around the old French fort south of Khe Sanh and the 1st Brigade at LZ Snapper. From the base, 1/9 Marines attacks south and takes Hill 471 against strong counterattacks, and the 3rd ARVN Airborne Task Force lands east of Khe Sanh on 7 April. At 08:00 on 8 April 2/7 Cavalry walks into the base along Route 9, and the siege is formally lifted after 77 days. Pegasus ends on 15 April; the Marines abandon the base in early July.
At Khe Sanh: Standard NVA rifle
Mikhail Kalashnikov's AK-47 became the world's most widespread military rifle thanks to its simplicity and reliability in mud, heat and rain. North Vietnamese and Viet Cong troops carried both Soviet AKs and the Chinese-made copy, the Type 56.
At Khe Sanh: Anti-armour and bunker weapon
The Soviet RPG-2 was a simple reusable launcher firing an over-calibre shaped-charge grenade. In Vietnam it was widely used under the designation B40, against armored vehicles, bunkers and buildings, alongside the later RPG-7 (B41).
At Khe Sanh: Shelled the base and hill outposts daily
The Soviet 82-BM-37 and its Chinese copy, the Type 53, were standard battalion mortars of communist forces in Vietnam. An 82 mm tube could also fire captured US 81 mm rounds, though not the other way around.
At Khe Sanh: Marine and Army rifle
Developed from Eugene Stoner's AR-15, the lightweight M16 replaced the M14 in Vietnam. Early rifles gained a reputation for jamming, linked to ammunition changes, a lack of cleaning kits and training; the improved M16A1 followed in 1967.
At Khe Sanh: Section machine gun on the perimeter and hills
The belt-fed M60 was the standard US infantry machine gun of the Vietnam War, nicknamed "the Pig" for its weight and appetite for ammunition. It drew on design ideas from the German MG 42 and FG 42.
At Khe Sanh: 105 mm howitzers on the base and Hill 881S
The M2A1, later redesignated M101A1, was the standard US light field howitzer from World War II through Vietnam. In Vietnam it was often lifted by helicopter into firebases to support air-mobile infantry.
At Khe Sanh: Arc Light strikes of Operation Niagara
Designed to carry nuclear weapons, the B-52 was adapted in Vietnam for massed conventional bombing under the code name Arc Light. Flying too high to be seen or heard from the ground, a formation could saturate a large box of terrain with bombs.
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The Marine Corps and Air Force official histories (Shore; Shulimson; Camp and Blasiol; Nalty) give the siege in detail; the relief rests on Nalty and Tolson.
The combat base, Hills 881S, 881N, 861 and 950, Khe Sanh village and Lang Vei are fixed; Hills 861A and 558, the quarry, Alpha-1 and Hill 471 are placed from distances in the histories.
Company positions are as the histories give them; NVA regiments, trench lines and the relief landing zones are schematic.
The Marine and Air Force histories agree on the sequence; strengths and losses differ and are given as ranges.
