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| Operation Diamond Head | |||||||
|---|---|---|---|---|---|---|---|
| Part of theVietnam War | |||||||
 M113s of the 2nd Battalion, 22nd Infantry, 10 September 1967 | |||||||
| |||||||
| Belligerents | |||||||
 United States |  North Vietnam | ||||||
| Commanders and leaders | |||||||
| MGJohn C. F. Tillson | |||||||
| Units involved | |||||||
| 3rd Brigade, 25th Infantry Division | 101st Regiment 165th Regiment | ||||||
| Casualties and losses | |||||||
| 35 killed | USbody count: 136 killed | ||||||
Operation Diamond Head was an operation conducted by the3rd Brigade, 25th Infantry Division inTây Ninh Province, lasting from 11 July to 31 October 1967.[1]: 367
In May 1967, U.S. intelligence located aPeople's Army of Vietnam (PAVN) supply base in the Angel's Wing area ofCambodia'sSvay 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 the2nd Battalion, 12th Infantry Regiment and the3rd Battalion, 2nd Infantry Regiment and eightSouth Vietnamese Regional Force companies conducting sweeps between theVàm Cỏ Đông River and the Cambodian border.[1]
On 14 July, South Vietnamese agents reported that the PAVN planned to attackTây Ninh city and that night PAVN forces attacked positions between Tây Ninh andDầu Tiếng District. The border sweeps were immediately cancelled and on 15 July the two US 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 PAVN 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 twoM113s withRocket-propelled grenades. On 4 September the same company engaged a PAVN force nearBlack Virgin Mountain losing four killed.[1]: 368
In late September, the2nd Battalion, 34th Armor Regiment joined the operation and were tasked with defendingTây Ninh Combat Base. The other Battalions swept theMichelin 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 the1st Infantry Division swept theLong Nguyen Secret Zone inOperation Shenandoah II.[1]: 368
Operation Diamond Head officially concluded on 31 October and PAVN losses were 136 killed whereas U.S. losses were 35 killed.[1]: 385
This article incorporatespublic domain material from websites or documents of theUnited States Army Center of Military History.
This article incorporates text from this source, which is in thepublic domain.
