Operation Diamond Head

Operation Diamond Head was an operation conducted by the 3rd Brigade, 25th Infantry Division in Tây Ninh Province, lasting from 11 July to 31 October 1967.[1]


In May U.S. intelligence located a People's Army of Vietnam (PAVN) supply base in the Angel's Wing area of Cambodia's Svay Rieng Province and learned that a two battalion attack would be made from this sanctuary into Tây Ninh Province in July.[1]


The operation commenced on 11 July with the 2nd Battalion, 12th Infantry Regiment and the 3rd Battalion, 2nd Infantry Regiment and 8 South Vietnamese Regional Force companies conducting sweeps between the Vàm Cỏ Đông River and the Cambodian border.[1]

On 14 July South Vietnamese agents reported that the PAVN planned to attack Tây Ninh city and that night PAVN forces attacked positions between Tây Ninh and Dầu Tiếng District. The border sweeps were immediately cancelled and on 15 July the 2 Battalions, reinforced by the 2/22nd Infantry (Mechanized) moved to the scene of the attacks but the PAVN had fled. On 18 July a U.S. patrol engaged and killed several members of the PAVN 165th Regiment.[1]

The 2 Battalion attack never eventuated and the operation continued with only sporadic contact resulting in 61 PAVN and 31 U.S. killed by the end of August.[1]:368

On the night of 2 September a PAVN force attacked a U.S. company's night defensive position destroying 2 M113s with Rocket-propelled grenades. On 4 September the same company engaged a PAVN force near Black Virgin Mountain losing 4 killed.[1]:368

In late September the 2nd Battalion, 34th Armor Regiment joined the operation and were tasked with defending Tây Ninh Combat Base. The other Battalions swept the Michelin Rubber Plantation claiming to have killed 75 PAVN and locating several supply caches.[1]:368

During October the 3rd Brigade formed a blocking force in the eastern Michelin Plantation while the 1st Infantry Division swept the Long Nguyen Secret Zone in Operation Shenandoah II.[1]:368


Operation Diamond Head officially concluded on 31 October, PAVN losses were 136 killed, U.S. losses were 35 killed.[1]:385


 This article incorporates public domain material from websites or documents of the United States Army Center of Military History.

  1. ^ a b c d e f g h i MacGarrigle, George (1998). Combat Operations: Taking the Offensive, October 1966 to October 1967. Government Printing Office. p. 367. ISBN 9780160495403.
List of allied military operations of the Vietnam War (1967)

This article is a list of known military operations of the Vietnam War in 1967, 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 (A–F)

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

Michelin Rubber Plantation

Michelin Rubber Plantation was located near Dầu Tiếng District in Bình Dương Province, 72 km northwest of Saigon. The plantation was established by the Michelin company in 1925 and at 12,400 hectares (31,000 acres) it was the largest rubber plantation in Vietnam. The plantation was located approximately halfway between the Cambodia border and Saigon and so was an important base and staging area for the Viet Cong and later the PAVN. The plantation was an important source of revenue for the South Vietnamese Government and it was believed that the Michelin Company paid off the Vietcong in order to keep the plantation operating during the war. US forces were obliged to compensate Michelin for damage caused to the rubber trees during operations in the plantation.

US and Army of the Republic of Vietnam (ARVN) forces conducted frequent operations against PAVN and VC forces in the plantation. On the evening of 27 November 1965 the ARVN 7th Regiment, 5th Division was overrun by the VC 272nd Regiment, killing most of the Regiment and 5 US advisers. From 21 to 27 February 1966 the 2nd and 3rd Brigades, 1st Infantry Division conducted Operation Mastiff, a search and destroy operation in and around the plantation. From 22 February to 14 May 1967 3rd Brigade, 4th Infantry Division, 196th Infantry Brigade, 173rd Airborne Brigade, 11th Armored Cavalry Regiment, VNMC 1st and 5th Battalions and ARVN 35th and 36th Ranger Battalions conducted Operation Junction City which included operations in the plantation. From 17 May to 7 December 1967, the 3rd Brigade, 25th Infantry Division conducted Operation Diamond Head, a search and destroy operation in the Plantation and surrounding areas. In August and September 1968, known as the Phase III Offensive in reference to the third wave of PAVN attacks after the Tet Offensive the plantation was the scene of fighting between US forces and the PAVN. From 17 to 24 March 1969 the 1st Infantry Division, 11th Armored Cavalry Regiment, 1/4th Cavalry conducted Operation Atlas Wedge in the plantation.

In 1975 after the fall of Saigon, first the plantation and then the factory in Saigon was nationalized by the communist government.

Operation Manhattan

Operation Manhattan was an operation conducted by the 1st and 2nd Brigades, 25th Infantry Division and the 3rd Brigade, 4th Infantry Division in the Ho Bo Woods/Bến Củi area, lasting from 23 April to 7 June 1967.

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