In June 1966, after completing final training for Vietnam on Exercise Traiim Nau in the jungles and swamps of New Guinea, 3 Squadron SAS (Australian Special Air Service) embarked by boat and plane from Australia to set up a Forward Operating Base in Phuoc Tuy province, a swampy hell of jungle and paddy-fields forty-five miles east of Saigon. The Viet Cong main forces units had a series of bases in the jungle, and the political cadres controlled most of the villages. Arriving in Phoc Tuy province, the Australians found they had to build their camp in the middle of wet season, which had turned the ground into a mud-bath. They were also compelled to build in the heart of an enemy-dominated region while living under ponchos and being constantly sniped at. The Aussies were still working under these appalling conditions when three members of the legendary 22 SAS arrived secretly from Bradbury Lines, Hereford, to give assistance in what was to be a major assault against the Viet Cong. These three were Sergeant Jimmy 'Jimbo' Ashman, who had been with the Regiment since its foundation in North Africa in 1941; Sergeant Richard 'Dead-eye Dick' Parker, who had previously fought with the SAS in Malaya, Borneo and Aden; and Lieutenant-Colonel Patrick 'Paddy' Callaghan, who had been pulled out of administration specially for this secret mission. The presence of the British SAS among the proud Australians, initially a source of resentment and conflict, eventually led to mutual respect. Working side by side, Brits and Aussies forged themselves into a potent fighting machine which was tasked with the fearsome job of rooting the Viet Cong out of the labyrinth tunnel system where they lived and died. It was a journey into hell, from which some would never return.