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.

[2]: 291 [3]: E-18  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.

[2]: 418–20 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.

1st Division commander General Ngô Quang Trưởng reinforced O'Reilly with another Regiment and the ARVN defended the base for two months before abandoning it in early October.

[3]: E-24–5 [3]: G-6–9 [4] On 12 August, 101st Airborne commander Major general John J. Hennessey terminated the operation to allow the ARVN to concentrate on defending Firebase O’Reilly.