8 Jan 1966 – 14 Jan 1966
Area of Operation: Binh Duong Province, Hau Nghia Province, III Corps. Particularly the HoBo Woods, west of the Iron Triangle.
Allied Units: US Army 1/16th, 1/28th, and 2/28th Infantry of 3d Brigade 1st Infantry Division, 1/503rd and 2/503rd Airborne of 173rd Airborne Brigade; 1st Battalion Royal Australian Regiment (1RAR)
Allied Casualties: Unclear. An after action report from the 173rd Abn Bde cites “friendly losses” at 6 KIA and 45 WIA. These numbers likely do not take into consideration the casualties of 3d Bde 1st Inf Div, or 1RAR.
Enemy Units: Viet Cong 7th Cu Chi Battalion, D308 VC Company
Enemy Casualties: 107 KIA, 9 POW
Objective: Search and destroy, with particular focus on locating and destroying the headquarters of Viet Cong Military Region IV.
Significance/Notes: The Cu Chi Tunnels were discovered during Operation Crimp. This added a new dimension to the style of war being fought by the Communists, and necessitated a proper response from the US and its allies. Crimp was immediately followed by Operation Buckskin to clear the tunnels. (Note: Some sources combined the information from both operations.)
The Cu Chi Tunnels can be visited today.
- The Vietnam Center and Archive (at Texas Tech Univ)
- Vietnam War Almanac by James H. Willbanks
- The Encyclopedia of the Vietnam War: A Political, Social, and Military History edited by Spencer C Tucker
Vietnam Battle Chronology: U.S. Army and Marine Corps Combat Operations, 1965-1973by David Burns Sigler
- “Combat Operations After Action Report” from the 173rd Abn Bde
- “Viet Cong Tunnels,” Australia and the Vietnam War
- “Why Were the Soil Tunnels of Cu Chi and Iron Triangle in Vietnam So Resilient?” by Kenneth R. Olson and Lois Wright Morton – Scientific article in the Open Journal of Soil Science, published February 2017
- The Tunnels of Cu Chi: A Harrowing Account of America’s Tunnel Rats in the Underground Battlefields of Vietnam by Tom Mangold
- Tunnel Rat in Vietnam by Gordon L. Rottman
Viet Cong and NVA Tunnels and Fortifications of the Vietnam Warby Gordon L. Rottman
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