Texas Tech University

Dewey Canyon I

Operation
Title
Dewey Canyon I
Start Date
1/22/1969
End Date
3/18/1969
CTZ
I
TAO
Quang Tri Province and Thua Thien Provinces - A Shau Valley toward Da Krong Valley
Objective
to deny the Communist forces access to the critical populated areas of the coastal lowlands; conducted in response to a Communist buildup in Base Area 611 in the Da Krong Valley
Description
At the opening of the operation the 9th Regiment was sent into the Da Krong Valley, where they were completely dependent on helicopters for logistical support. This was often difficult because it was monsoon season. They developed fire support bases (FSBs) Shiloh, Razor, and Riley. As they pushed forward, the regiment opened more FSBs. Phase I of DEWEY CANYON focused on getting the forces established in the area. During Phase II, the troops cleared the area around the FSBs and prepared for Phase III. The 2/9th and 3/9th were ordered to extend their perimeters north of the Da Krong River, however because of the weather and limited supplies, they were later ordered to pull back in. This, along with the continued bad weather, allowed the Communist forces to prepare for an attack. Phase III began February 11 as the battalions moved away from the starting point at Phase Line Red and fought PAVN units as they advanced. From the 16-23 February, the Marines continued to push south and established new FSBs while collecting large quantities of arms and ordinance. Though the Marines were successful, PAVN fire made it difficult to resupply and evacuate troops. After 1 March, the weather created problems again. The only helicopters equipped to fly in the weather were Marine helicopters. However, they still managed to carry out missions within three hours from the demand. When the 1/9th pulled out on 18 March, the operation concluded as one of the most successful high-mobility regimental-size action of the war.
Allied Units Involved
Unit
9th Marines
Branch
Headquarters, United States Marine Corps
Branch Abbrv.
HQ, USMC
Unit
1st, 2d, 3d Battalions, 9th Marines
Branch
United States Marine Corps
Branch Abbrv.
USMC
Unit
2d Battalion, 3d Marines
Branch
United States Marine Corps
Branch Abbrv.
USMC
Unit
2d ARVN Regiment
Killed in Action
121 (USMC)
Wounded in Action
803 (USMC)
Enemy Units Involved
Unit
People's Army of Viet Nam
Branch Abbrv.
PAVN
Killed in Action
1,335-1,617 (PAVN)
Sources
Author
Shelby L. Stanton
Title
Vietnam: Order Of Battle
Author
Spencer C. Tucker
Title
The Encyclopedia Of The Vietnam War: A Political, Social & Military History
Author
National Archives and Records Administration
Title
Preliminary Checklist Of United States Military Operations In Southeast Asia