One of the most well-known Australian engagements of the Vietnam War - external site was the Battle of Long Tan - external site, 18 August 1966. The battle saw the action of 108 ANZACS against a Viet Cong (North Vietnamese) force - external site estimated between 1,500 and 2,500. The Battle was one of the heaviest conflicts of the Vietnam War as well as one the few battles in the recorded history of the world to be won against such odds. Vietnam Veterans' Day, celebrated in Australia on 18 August each year, commemorates the Battle of Long Tan and those Australians who served during the Vietnam War and is an opportunity to remember those who did not come home.