Operation Mastiff

Operation Mastiff
Part of the Vietnam War
Date21–25 February 1966
11°07′44″N 106°18′29″E / 11°07′44″N 106°18′29″E / 11.129; 106.308
 United StatesVietnam North Vietnam
Commanders and leaders
MGen Jonathan O. Seaman
1st Infantry Division9th Division
Casualties and losses
17 killedUS body count: 61 killed

Operation Mastiff was an operation conducted by the U.S. 1st Infantry Division in the Dầu Tiếng District, lasting from 21 to 25 February 1966.[1]


U.S. intelligence reports indicated that the People's Army of Vietnam (PAVN) 9th Division planned to attack the Army of the Republic of Vietnam (ARVN) 8th Regiment, 5th Infantry Division in the Dầu Tiếng District and was massing its forces in the Boi Loi Woods 12km south of Dầu Tiếng. U.S. commander General William Westmoreland ordered MGen Jonathan O. Seaman to launch a spoiling attack on the PAVN.[1]

Concerned about possible leaks by the ARVN III Corps staff, MGen Seaman shared a false plan indicating that the target was the Michelin Rubber Plantation east of Dầu Tiếng and B-52 strikes were conducted in that area to lend it credibility. It was hoped that this would cause the PAVN to move their forces to the west bank of the Saigon River where the real operation would take place. After this ruse had been in place for a week the real operation commenced.[1]

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