On 1 July a squad leader from the Viet Cong (VC) 1st Company, R-20 Doc Lap Battalion, surrendered to Marine forces and revealed that his unit was located south of the Thu Bồn River and east of An Hoa Base where they were preparing defenses to engage any Marine forces that might enter the area.

Further intelligence indicated that the VC were armed with heavy weapons including 5 12.7mm machine guns, 3 81mm mortars and 57mm recoilless rifles.

At 15:20 Company K, 3/9 Marines operating with LVTHs triggered the ambush with one LVTH being knocked out and its commander killed.

[1]: 205–6 On the morning of 14 July a Marine patrol 11 km east of An Hoa Base observed a 3-400 strong VC unit and called in air and artillery strikes on them, killing at least 30.

Air and artillery strikes were called in, but the VC resisted fiercely and the two groups were unable to link up until dusk.

[1]: 209–10 The rest of September and October saw little action in the Macon area of operations apart from attacks by fire, mines and booby-traps as the VC generally avoided contact.

[1]: 210 This article incorporates public domain material from websites or documents of the United States Marine Corps.