Operation Oklahoma Hills

Operation Oklahoma Hills was a clear and search operation during the Vietnam War mounted by the 1st Marine Division and the Army of the Republic of Vietnam (ARVN) 51st Regiment from 1 March to 29 May 1969.


The objective was to clear out People's Army of Vietnam (PAVN) units from their base camps and infiltration routes in the hills and valleys of Quảng Nam Province, southwest of Da Nang, particularly Happy Valley and Charlie Ridge (15°56′10″N 108°05′42″E / 15.936°N 108.095°E) 20-25km southwest of Da Nang.[1]:103[2]

The Marines had previously scoured the area in Operation Mameluke Thrust and Operation Maui Peak both of which ended in October 1968. Defector and prisoner interrogations gave intelligence about a renewed buildup of PAVN forces in the area and one prisoner, a captain in the 141st Regiment, gave detailed intelligence on infiltration routes into the area. He revealed that the main infiltration route was from Ai Yen along Route 614 and into Happy Valley, while another branch followed the Song Con river south to An Dien 8km northeast of Thường Ðức Camp and then along the Song Vu Gia river into Base Area 112 or Charlie Ridge.[1]:103 As the Marines had recently neutralized Base Area 112 in Operation Taylor Common it was decided that the next operation would be to clear the hills west of Da Nang.[1]:104

The terrain was expected to be a major challenge as Charlie Ridge was a steep and narrow mountain range with numerous gullies and ravines with thick undergrowth and dense overhead cover, while Happy Valley was covered by dense undergrowth, all of this would limit the effectiveness of supporting arms and make helicopter support more difficult.[1]:104

On 21 March the 1st Battalion, 7th Marines began a 10km march west along Route 4 from Firebase Rawhide to take Hill 52. On 24 March Company C secured Hill 52 and the Marines began construction of Firebase Mustang and on 30 March Battery K, 4th Battalion, 11th Marines was in position at Mustang.[1]:105


After sunset on 30 March the 2nd Battalion, 7th Marines landed at Hill 10 establishing Firebase Stallion and they began moving west into the operational area, at the same time 3rd Battalion, 7th Marines landed on Hill 41 and also began moving west and by the following morning both battalions were in positions along the slopes of Charlie Ridge.[1]:106

At 11:00 on 31 March HMM-165 helicopters landed the ARVN 2nd Battalion, 51st Regiment northeast of Thường Ðức Camp and the 3rd Battalion, 51st Regiment northwest of the camp. On 1 April the 3rd Battalion, 26th Marines and the 4.2in mortar battery from 1st Battalion, 13th Marines were landed at Landing Zone Robin overlooking Happy Valley.[1]:106

With the forces in place the 2/7 Marines and 3/7 Marines advanced west searching Charlie Ridge while the 3/26 Marines and the ARVN battalions searched southeast and northeast. Movement was extremely difficult in the thick jungle and the forces soon restricted themselves to operating along the network of trails, establishing company base camps and then sending platoon radiating out to search the trail network.[1]:106

On 1 April a reconnaissance team captured a PAVN sergeant from the 141st Regiment and Company K, 3/7 Marines captured a warrant officer from the 31st Regiment and they each revealed the location of their regimental base camps. Col. Robert L. Nichols decided to attack the base camp of the 141st Regiment near the summit of Hill 1166 and the 3/26 Marines was ordered to advance south up the ridgeline towards the Hill while 3/7 Marines advance from the east. By the afternoon of 7 April 3/26 Marines had secured Hill 1166 and 3/7 Marines had secured Hill 1062 nearby.[1]:107 On the morning 8 April 3/26 Marines descended into the ravine containing the base camp engaging 20 PAVN soldiers as they attempted to escape to the southwest. The next day 3/26 Marines continued to search the camp area skirmishing with small groups of PAVN. On 11 April 2/7 Marines advanced on the 31st Regiment base camp on Hill 745 discovering over 200 structures. By 15 April the PAVN had abandoned their base areas.[1]:108

1/7 Marines patrolled the south of the operational area along the Song Vu Gia carrying out ambushes of likely PAVN lines of communication between Charlie Ridge and the Arizona Territory to the south and on the night of 13 April ambushed a group of 30 PAVN as they crossed the river killing 14.[1]:109

On 21 April 2/7 Marines and Battery H 3/11 Marines were withdrawn from the operation and replaced by an ARVN battalion on Firebase Buckskin on Hill 502. The remaining units participating in the operation were now assigned general areas of responsibility sweeping Happy Valley and Charlie Ridge encountering scattered groups of PAVN.[1]:110

On the afternoon of 21 April intelligence indicated that a PAVN force was moving from the Arizona Territory north towards the Song Vu Gia and 1/7 Marines established ambush positions along the north bank of the river. After sunset small groups of PAVN were observed on the south bank of the river but the Marines held their fire and at 21:00 a large group of PAVN emerged from the bush on the south bank bring 17 small boats with them. When the PAVN boats started crossing the river the 1/7 Marines opened fire with recoilless rifles, 81mm mortars, machine-gun and rifle fire while pre-registered artillery engaged the PAVN remaining on the south bank. 57 PAVN dead were later counted floating in the river. At dawn on 22 April air strikes hit the south bank and at 09:30 Company B, 1/7 Marines boarded LVT-5s to cross the river and search the south bank finding a further 14 dead PAVN.[1]:111-3

On 29 April the area of operations was extended south of the Song Vu Gia into the northern Arizona Territory and that night Companies B and D, 1/7 Marines crossed the river and established positions near the village of My Hoa. On the morning of 30 April the two companies advanced southeast and Company B on the right flank was engaged by a PAVN force, Company D then swung round to the northwest and both companies then began attacking southwest into a PAVN force estimated to be two companies strong. The fighting continued throughout the day and into 1 May and the 3rd Battalion, 1st Marines operating north of Go Noi Island to the northeast was sent by truck to assist the 1/7 Marines. On the morning of 2 May 3/1 Marines began advancing east and by midday had linked up with 1/7 Marines and that evening both battalions crossed north over the Song Vu Gia. The sweep of the northern Arizona Territory had killed 60 PAVN for the loss of 9 Marines.[1]:113-4

On 2 May Companies K and L, 3/26 Marines and Battery C, 1/13 Marines were withdrawn from the operation.[1]:110

From 6-12 May Company I, 3/7 Marines conducted a sweep of the Song Tan Thong river area west of Happy Valley with minimal results.[1]:114

On 9 May 3/1 Marines left the operation.[1]:114

On 21 May Company L, 3/7 Marines began a 5-day sweep of the Ken Valley with minimal results.[1]:115

On 26 May after completing the destruction of the 31st Regiment base the ARVN 1st Battalion, 51st Regiment was withdrawn from the operation and on 29 May after destroying the remaining firebases the 3/7 Marines withdrew from the area.[1]:115


The operation concluded on 29 May. The operation was regarded as a success because while the PAVN generally did not stand and fight, the disruption of their base areas and lines of communication was believed to have led to a substantial decline in activity in the Da Nang area. Forty-four Marines were killed during the operation and 439 suffered injuries requiring medical evacuation. The US claimed that 589 PAVN were killed.[1]:116


Joseph Atkinson Fires his Rifle, Operation Oklahoma Hills, 1969 (15179864765)

Marine in action

Marines with Vietnamese Scout, 1969 (15179482662)

Marines, led by a Vietnamese Kit Carson Scout

Marines of M Company, 3d Battalion, 26th Marines, 1969 (15179512062)

3/26 Marines move through Happy Valley

Vietnamese Villagers Ceremony, 1969 (14993315367)

Villagers of Bon Ton Village conduct ceremony for Marines


 This article incorporates public domain material from websites or documents of the United States Marine Corps.

  1. ^ a b c d e f g h i j k l m n o p q r s t Smith, Charles (1988). U.S. Marines in Vietnam: High Mobility and Standdown, 1969. History and Museums Division, Headquarters U. S. Marines. ISBN 978-1494287627. This article incorporates text from this source, which is in the public domain.
  2. ^ Kelley, Michael (2002). Where we were in Vietnam. Hellgate Press. p. 5–102. ISBN 978-1555716257.
1st Division (South Vietnam)

The 1st Division of the Army of the Republic of Vietnam (ARVN)—the army of the nation state of South Vietnam that existed from 1955 to 1975—was part of the I Corps that oversaw the northernmost region of South Vietnam, the centre of Vietnam.

The 1st Division was based in Huế, the old imperial city and one of two major cities in the region, which was also the corps headquarters. This division was also tasked with the defence of Quảng Trị, the closest town to the Vietnamese Demilitarized Zone (DMZ) and among the first to be hit by the Tet Offensive.

26th Marine Regiment (United States)

The 26th Marine Regiment (26th Marines) is an inactivated infantry regiment of the United States Marine Corps. The 26th Marines were activated in 1944 and fought in the Battle of Iwo Jima during World War II and were activated again on March 1, 1966, and fought in the Battle of Khe Sanh during the Vietnam War.

3rd Battalion, 7th Marines

The 3rd Battalion 7th Marine Regiment (3/7) is an infantry battalion of the United States Marine Corps. They are based at the Marine Corps Air Ground Combat Center Twentynine Palms and consist of approximately 800 Marines. The battalion falls under the command of the 7th Marine Regiment and the 1st Marine Division. The battalion has seen combat in World War II, the Korean War, the Vietnam War, the Gulf War and was a part of the main effort during the initial invasion of Iraq in 2003. They have since deployed five times in support of Operation Iraqi Freedom as well as three times in support of Operation Enduring Freedom, and continue operations in Afghanistan. The unit has a long, decorated history with countless achievements. Its members were described as "true professionals" by embedded reporters during the 2003 invasion of Iraq.

7th Marine Regiment

The 7th Marine Regiment is an infantry regiment of the United States Marine Corps based at Marine Corps Air Ground Combat Center Twentynine Palms, California. Nicknamed the "Magnificent Seventh", they fall under the command of the 1st Marine Division and the I Marine Expeditionary Force.

Happy Valley, Vietnam

Happy Valley (15°55′00″N 107°58′00″E) was the name given by US Marines to a valley southwest of Danang in Quảng Nam Province, Vietnam

Kit Carson Scouts

The Kit Carson Scouts belonged to a special program initially created by the U.S. Marine Corps during the Vietnam War involving the use of former Viet Cong combatants as intelligence scouts for American infantry units. Enemy cadre and combatants (e.g. Viet Cong, NVA) who defected and rallied to become aligned with the Saigon government were known as Chiêu Hồi or Hồi Chánh Viên, the latter being a term loosely translated as "members who have returned to the righteous side". Only a very small number of these Chieu Hoi were selected, trained, and deployed with American infantry units as Kit Carson Scouts.

List of allied military operations of the Vietnam War (1969)

This article is a list of known military operations of the Vietnam War in 1969, conducted by the armed forces of the Republic of Vietnam, the United States and their allies.

List of allied military operations of the Vietnam War (M–S)

This article is a list of known military operations of the Vietnam War, a war fought by the United States to try to stop communism in Southeast Asia, conducted by the armed forces of the Republic of Vietnam, the United States and allies consisting of Australia, New Zealand, Thailand, South Korea, and the Philippines. This is not a complete list. Operations are currently listed alphabetically, but are being progressively reorganised as a chronology.

Lob bomb

A lob bomb (known officially as an improvised rocket-assisted mortar, improvised rocket-assisted munition, or IRAM) is a rocket-fired improvised explosive device made from a large metal canister (usually a propane gas tank that has been drained of its contents and filled with explosives, scrap metal, and ball bearings), which has been used by insurgents and coalition forces during the Iraq War since late 2007. The weapon is essentially an airborne version of an improvised explosive device.

Ormond R. Simpson

Ormond Ralph Simpson (March 16, 1915 – November 21, 1998) was a highly decorated officer of the United States Marine Corps with the rank of Lieutenant General, who held a number of important assignments throughout his career. He is most noted as commanding general of 1st Marine Division during Vietnam War and later as Director of Personnel and Deputy Chief of Staff for Manpower at Headquarters Marine Corps.

This page is based on a Wikipedia article written by authors (here).
Text is available under the CC BY-SA 3.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.