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[Wash]ington to confirm that the squadron was available for deployment. The plan was never carried through.

With the arrival of reinforcements, the 1st Battalion, Royal Australian Regiment, left South Vietnam, having completed almost a full year of combat duty. In leaving, the "diggers" could point with pride to a creditable performance during their stay, highlighted by participation in no fewer than nineteen major operations. Of particular note was an operation conducted in January 1966 which resulted in one of the biggest intelligence coups of the war up to that time. During a sweep of the so-called Iron Triangle, an area near Saigon heavily fortified and controlled by the Viet Cong, the Australian unit discovered a vast complex of tunnels, dug 60 feet deep in some places, which turned out to be a Viet Cong headquarters. In addition to capturing five new Chinese Communist antiaircraft guns, the Australians discovered 6,000 documents, many revealing names and locations of Viet Cong agents.

The effectiveness of the new Australian contingent was clearly demonstrated during the remainder of the year during which Australian troops killed more than 300 of the enemy, captured large stores of material, and helped secure Highway 15. Particularly successful was a battle conducted on 18 August 1966. Sweeping through a French rubber plantation called Binh Ba, 42 miles southeast of Saigon, Delta Company, 6th Battalion, Royal Australian Regiment, ran head on into a force estimated as 1,500 North Vietnamese and Viet Cong. In the initial exchange and at point-blank range the Aussies suffered most of their casualties. For three hours and in a blinding monsoon rain this company of approximately 108 men fought the enemy in a standstill. Taking advantage of their numbers, the enemy troops tightened the noose around the company, charged in human-wave attacks, but were beaten back continually. The fighting became so intense that the Australians ran low on ammunition and their helicopter pilots braved both the rain and heavy enemy fire to effect resupply. With the noise deadened by the downpour, a company of Australian reinforcements in armored personnel carriers moved unseen through the surrounding terrain and provided supporting fires with .50-caliber machine guns. At the same time Australian and other allied artillery units found the range to the targets. In the end, Delta Company routed the enemy troops from the battlefield, forcing them to leave behind 245 of their dead. During roughly four hours the Aussies killed