During late November 1967, U.S. intelligence detected that the People's Army of Vietnam (PAVN) 22nd Regiment of the 3rd Division was about to commence operations in the Bồng Sơn area.

The 1/8th then began moving east towards the blocking forces, but met strong resistance from the entrenched PAVN and pulled back to allow tactical air strikes and artillery to soften up the positions.

At 14:06 Companies A and B 1/8th, supported by flamethrower APCs, resumed the advance and broke through the PAVN positions while the 2/8th attacked westward.

[2]: 7 On the morning of 11 December following artillery preparation, 1/12th Cavalry assaulted Truong Lam (2) and met sporadic resistance until midday.

[2]: 7 On 12 December the combined force of the Vietnamese Marines, 1/12th Cavalry and Company D 1/50th began a sweep of the area.

Despite intensive air and artillery preparation the attack was repulsed and the force withdrew to allow for further supporting fire to soften up the PAVN positions.

Artillery and air strikes continued throughout the night and the following morning Company B 2/8th swept through An Nghiep, meeting no resistance from the destroyed PAVN bunkers.

[2]: 10 The 2/8th Cavalry remained in An Nghiep for three days, destroying bunkers and recovering PAVN dead and weapons.