Operation Chicago Peak
U.S. Army and A.R.V.N. Operation during the Vietnam War
Operation Chicago Peak was a joint U.S. Army and Army of the Republic of Vietnam (ARVN) military operation during the Vietnam War designed to keep pressure on the People's Army of Vietnam (PAVN) units in the A Sầu Valley and prevent them from mounting any attacks on the neighboring coastal provinces.
Background
The A Sầu Valley was an important corridor for the PAVN and Viet Cong (VC), who used it to transport supplies from Laos into South Vietnam as well as a staging area for attacks. Previous sweeps of the valley in Operation Delaware (19 April – 17 May 1968), Operation Dewey Canyon (22 January – 18 March 1969), Operation Massachusetts Striker (28 February - 8 May 1969) and Operation Apache Snow (10 May - 7 June 1969) in the preceding years had temporarily disrupted PAVN operations, but were unsuccessful at removing the PAVN/VC from the valley.
The operation was scheduled to commence with the end of the monsoon and U.S. forces launched Operation Texas Star on 1 April to establish firebases to support the operation. However the Battle of Fire Support Base Ripcord and the engagement of PAVN forces on the Khe Sanh plateau in Operation Clinch Valley forced the postponement and scaling back of the operation. One of the objectives of the operation, the Co Pung Mountain area, 4 km northeast of the A Sầu was found to be heavily defended by PAVN with 11 helicopters damaged by anti-aircraft fire and the acting commander of the 101st Airborne Division, Brigadier general Sidney Bryan Berry, was instructed to avoid heavy U.S. casualties.
Operation
The scaled-back operation was finally launched on 25 July with the 2nd Battalion, 502nd Infantry Regiment landed to reopen Firebase Maureen east of Co Pung Mountain. On 30 July with artillery support from Firebase Maureen, the ARVN 3rd Regiment, 1st Infantry Division was landed on Co Pung Mountain. After some initial fighting, the PAVN withdrew from the mountain.
On 6 August the PAVN 6th Regiment attacked the ARVN 1st Regiment's Firebase O'Reilly 8 km north of Ripcord.
Begin with the source’s own compact description: “Operation Chicago Peak” is u.S. Army and A.R.V.N. Operation during the Vietnam War. The dossier treats that line as a proposition to test through Operation, Chicago and Peak, not as a finished interpretation.
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Contemporary correspondence, administrative files and participant testimony can test how later narratives organized the event or institution. The source revision retrieved here is dated Aug 22, 2026. The linked authority identifier is Q85790893. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1968 and 1969.
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This entry incorporates text from “Operation Chicago Peak” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.