Qualla: Operation Dewey Canyon

Operation Dewey Canyon: Introduction

Fri, 12 Jun 2026 00:00:00 GMT

Photo credit USMC Archives from Quantico, USA, CC BY 2.0. The valleys had been enemy territory for years. North Vietnamese Army forces used the A Shau Valley — 34 kilometers long, pressed close to the Laotian border — as a staging and supply corridor, moving men and materiel south along routes that American units had spent years trying to close. The Marines assigned to the northern I Corps region had spent much of 1967 and 1968 tied to their combat bases, manning defensive positions along what planners called the McNamara Line. When Major General Raymond G. Davis took command of the 3rd Marine Division, he ordered his Marines to leave those bases and go find the enemy. In January 1969, they did.

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Image: USMC Archives from Quantico, USA | CC BY 2.0

Operation Dewey Canyon: The McNamara Line and the Shift in Strategy

Fri, 12 Jun 2026 00:00:00 GMT

Photo credit USMC Archives from Quantico, USA, CC BY 2.0. The McNamara Line — named for Defense Secretary Robert McNamara — was a combination of infantry positions and ground sensors intended to detect and interdict North Vietnamese infiltration across the border and along the Ho Chi Minh Trail. In concept, it was an electronic barrier ...

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Image: USMC Archives from Quantico, USA | CC BY 2.0

Operation Dewey Canyon: Into the A Shau

Fri, 12 Jun 2026 00:00:00 GMT

Photo credit USMC Archives from Quantico, USA, CC BY 2.0. The operation began formally on January 22, 1969, though preliminary movements had started days earlier. The 9th Marine Regiment helicoptered its battalions from Vandegrift Combat Base to a series of firebases in the hills above the valleys — Firebase Henderson, Firebase Tun Tave...

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Image: USMC Archives from Quantico, USA | CC BY 2.0

Operation Dewey Canyon: Across the Border

Fri, 12 Jun 2026 00:00:00 GMT

Photo credit USMC Archives from Quantico, USA, CC BY 2.0. By late February, elements of the 9th Marines had pushed to within 1,000 meters of the South Vietnamese border with Laos — and then, in a move that would remain politically sensitive for years, crossed it. Operations in Laos were not authorized under the rules of engagement that ...

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Image: USMC Archives from Quantico, USA | CC BY 2.0

Operation Dewey Canyon: Valor and Concealment

Fri, 12 Jun 2026 00:00:00 GMT

Photo credit Public domain. The contradictions of Operation Dewey Canyon cut in multiple directions. The operation produced extraordinary acts of courage: four Marines received the Medal of Honor, six earned Navy Crosses, and 55 received Silver Stars during the 56-day campaign. These were not token recognit...

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Image: Public domain

Operation Dewey Canyon: After the Valleys

Fri, 12 Jun 2026 00:00:00 GMT

Photo credit USMC Archives from Quantico, USA, CC BY 2.0. Operation Dewey Canyon ended on March 18, 1969. Its commanders assessed it as a tactical success: significant North Vietnamese Army forces had been disrupted, supply caches destroyed, and the valleys swept clean — at least temporarily. But as the after-action reports acknowledged...

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Image: USMC Archives from Quantico, USA | CC BY 2.0