On the night of 23 August the 66th Regiment and the 20th Sapper Battalion gathered near Duc Lap Camp in preparation for their attack on the base while the 320th Regiment established a blocking position on Highway 14 northeast of Duc Lap to intercept allied ground units. After midnight on 24 August 2 squads from the 20th Sapper Battalion cut through the perimeter wire around the Duc Lap subsector headquarters, entered the compound and threw satchel charges at buildings and fighting positions while infantry provided covering fire. One of the satchel charges hit the advisory team headquarters, wounding 5 U.S. advisers inside. When the advisers emerged from the headquarters they were hit by heavy weapons fire which killed 1 adviser and forced the rest back into the building, they then radioed Duc Lap camp for assistance but were informed that it was also under attack. At Duc Lap Camp the PAVN had penetrated the northern perimeter wire and occupied part of a hill inside the camp. An AC-47 Spooky gunship soon arrived overhead and began firing on PAVN mortar and machine-gun positions. After a meeting at ARVN 23rd Division headquarters in Buôn Ma Thuột, I Field Force, Vietnam commander General William R. Peers ordered the 4th Battalion, 503rd Infantry Regiment to be airlifted from Tuy Hòa Base Camp to Buôn Ma Thuột to join a newly created Task Force Spoiler to be commanded by Col. Herbert J. McChrystal. Task Force Spoiler would include McChrystal's 2nd Brigade, 4th Infantry Division, the 1st Squadron, 10th Cavalry Regiment, two troops from the 7th Squadron, 17th Cavalry and seven artillery batteries. 23rd Division commander, General An, ordered a battalion from the 47th Infantry Regiment to redeploy from Phú Yên Province to Buôn Ma Thuột and 2 battalions from the 45th Regiment to proceed towards Duc Lap and also received permission from the II Corps commander to fly several MIKE Force companies into Duc Lap. On the morning of 24 August U.S. helicopters landed a MIKE Force company outside the Duc Lap camp and they proceeded to engage the PAVN forces on the north end of the camp suffering heavy losses. When helicopters landed on the camp airfield to evacuate casualties, PAVN machine guns on the hill shot down 4 UH-1s. Later that afternoon the ARVN 2nd Battalion, 45th Regiment was landed near the Duc Lap subsector headquarters with 2 UH-1s shot down. At dusk 2 MIKE Force companies were landed 3km south of Duc Lap Camp. On 25 August the PAVN renewed their attack against the subsector headquarters, but the remaining 61 troops defenders held out until rescued later that day by the ARVN 2nd Battalion, 45th Regiment which then forced the PAVN to retreat from the village. Meanwhile at Duc Lap Camp the PAVN had forced the defenders back into the southern end of the camp. Battery A, 4th Battalion, 42nd Artillery Regiment was airlifted into the landing zone 3km south of the camp and the 2 MIKE Force companies there then moved north and fought their way into Duc Lap Camp by 13:00. The MIKE Forces hit the PAVN flank as they were assaulting the southern end of the camp pushing them back to the northern hill. Following air and artillery strikes the original 2 companies plus a third which had been flown in from Pleiku then assaulted the hill. Three U.S. advisers and a number of the CIDG troops were killed in the assault, but by 19:00 they had cleared the PAVN from the camp. On 26 August the ARVN 2nd Battalion, 45th Regiment, continued to pursue the PAVN north in the hills north of the town and by 27 August the battle was over.
Aftermath
Allied casualties for the battle of Duc Lap were 114 killed and 238 wounded. I Field Force estimated that over 700 PAVN had been killed, most from air and artillery strikes.
