# OPERATION DEWEY CANYON 1969 VIETNAM WAR OFFENSIVE 25252

This U.S. Marine Corps film chronicles Operation Dewey Canyon, which was the last major offensive by the United States Marine Corps during the Vietnam War. It took place from January 22 through March 18, 1969 and involved a sweep of the North Vietnamese Army (NVA)-dominated A Shau Valley by the 9th Marine Regiment reinforced by elements of the 3rd Marine Regiment. The 56 days of combat were a tactical success but did not stop the overall flow of North Vietnamese men and matériel into South Vietnam. The 9th Marine Regiment and attached units were awarded the Army Presidential Unit Citation for their actions in Operation Dewey Canyon. Dewey Canyon would be a three-phase operation. In Phase I, the regiment would move into the area of operations and establish fire support bases for the supporting artillery of the 2nd Battalion, 12th Marines (2/12). Phase II would consist of patrolling near the fire support bases and aligning the infantry units for a jump-off into the next phase. Phase III called for a conventional three-battalion advance southward, with the infantry units moving overland rather than by helicopter because heavy anti-aircraft defenses in the area of the Phase III objectives made movement by foot preferable to General Davis' usual concept of high-mobility heliborne operations. But because the area was in the remote southwest corner of Quang Tri Province, helicopters would still be critical in the early phases and in resupplying the troops on the ground. In the…

- Kind: Film
- Genres: War, Industrial and advertising
- Archive: [Internet Archive](https://archive.org/details/25252OperationDeweyCanyon)
- Licence or status: none stated by the archive
- Who can watch: Teens profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/ia/25252OperationDeweyCanyon?play=1)