The Viet Cong fought.
The Battle of Long Khanh ( 6 -- 7 June 1971 ) was fought during the Vietnam War between elements of 1st Australian Task Force ( 1 ATF ) and the Viet Cong and North Vietnamese Army during Operation Overlord . Vietnam War . It was the second of the Indochina Wars and was officially fought between North Vietnam and the government of South Vietnam . The Viet Cong ( also known as the National Liberation Front , or NLF ) , a South Vietnamese communist common front aided by the North , fought a guerrilla war against anti-communist forces in the region , while the People 's Army of Vietnam , also known as the North Vietnamese Army ( NVA ) , engaged in more conventional warfare , at times committing large units to battle .