Operation Somerset Plain

The assault into the A Sầu Valley was preceded by an artillery bombardment from Firebase Berchtesgaden and Firebase Georgia and B-52 and tactical fighter-bomber strikes while tear gas was dropped at three routes into the valley from Laos.^{[1]: 607–8}

On 4 August 1968 helicopters operating from Firebase Birmingham landed the first elements of the 1st Brigade, 101st Airborne Division in the valley near the abandoned A Lưới Camp. Resistance was light with only one helicopter gunship being forced down by PAVN fire. On 5 August elements of the ARVN 1st Division were landed in the southern part of the valley and on 6 August the elite ARVN Hac Bao (Black Panther) Reconnaissance Company arrived in the valley completing the deployment of forces.^[1]: 608

The U.S./ARVN forces proceeded to search the valley meeting only scattered resistance until 10/11 August when the ARVN 3rd Battalion, 1st Infantry Regiment was attacked by elements of the PAVN 816th and 818th Main Force Battalions. Air and artillery support was called in and the PAVN retreated into the jungle losing several dozen killed.^[1]: 608

Also on 10 August a misplaced air strike hit Company D, 2nd Battalion, 327th Infantry Regiment, killing seven and wounding fifty-four men.^[1]: 608

On 16 August, two Long-range reconnaissance patrol teams and elements of Company C, 326th Engineer Battalion, laid delayed fuse mines and sensors (connected to Firebase Berchtesgaden) at the western passes into Laos to impede and monitor PAVN movement.^[1]: 608

On 17 August the U.S./ARVN force began to be lifted out of the valley and this proceeded without PAVN interference, concluding on 20 August.^[1]: 608

U.S. losses were 7 killed, while ARVN losses were 11 killed, 8 of which were from a U.S. artillery round that fell short. US/ARVN forces claims the PAVN losses were 181 killed and 4 captured.^[1]: 608

Only a modest amount of supplies were located and destroyed, which suggested that the PAVN had still not recovered from the effects of Operation Delaware.^{[1]: 608–9}

 This article incorporates public domain material from websites or documents of the United States Army Center of Military History.