The Battle of Khe Sanh was conducted in northwestern Quang Tri Province, Republic of Vietnam (South Vietnam), between 21 January and 9 July 1968 during the Vietnam War. The combatants were elements of the United States (U.S.) III Marine Amphibious Force (III MAF), elements of the South Vietnamese Army of the Republic of Vietnam (ARVN) and two to three division-size elements of the People's Army of Vietnam (PAVN - also referred to as the North Vietnamese Army (NVA)). The American command in South Vietnam gave the defense of the base the nickname Operation Scotland.
The American command in Saigon initially believed that combat operations around the Khe Sanh Combat Base during the summer of 1967 were just part of a series of minor North Vietnamese offensives in the border regions. That appraisal was altered when it was discovered that PAVN was moving major forces into the area during the fall and winter. A build-up of Marine forces took place and actions around Khe Sanh commenced when the Marine base was isolated. During a series of desperate actions that lasted 77 days, Khe Sanh Combat Base (KSCB) and the hilltop outposts around it were under constant North Vietnamese ground, artillery, mortar, and rocket attacks.