Operation Dewey Cannon

January 22, 1969, in Marine Corps history.
Operation Dewey Cannon
Posted on 1/22/2026

On January 22, 1969, Operation Dewey Canyon, arguably the most successful high-mobility regimental-size action of the Vietnam War, began in the A Shau/Da Krong Valleys when the 9th Marines, commanded by Colonel Robert H. Barrow, and supporting artillery were lifted from Quang Tri. By mid-March, the enemy's base area had been cleared out, 1617 enemy combatants had been killed, and more than 500 tons of weapons and ammunition were recovered. Barrow later went on to become the 27th Commandant of the Marine Corps.

*Image info: Robert H Barrow as Commandant of the Marine Corps. (USMC photo/released)


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