a major local setback for the VC, indefinitely forestalling an imminent movement against Nui Dat. Although there were other large-scale encounters in later years, 1 ATF was not fundamentally challenged again. The battle established the task force's dominance over the province, and allowed it to pursue operations to restore government authority. Regardless, during February 1967 the Australians suffered their heaviest casualties in the war to that point, losing 16 men killed and 55 wounded in a single week, the bulk during Operation Bribie. 5 RAR and 6 RAR completed their tours in mid-1967 and were replaced by 7 RAR and 2 RAR. The first New Zealand infantry, Victor Company RNZIR, arrived in May 1967 from Malaysia and served with the outgoing 6 RAR before and then with the newly arrived 2 RAR. What would ultimately prove to be a tactical blunder by 1 ATF Command and account for the majority of Australian and New Zealand casualties throughout the war, was the laying of a minefield over a 10 km area from Dat Do to the coast. By June 1967, close to 23,000 "jumping jack" mines had been laid by the Australian engineers within a 100-metre-wide strip of cleared ground between a double row of fences. Security of the minefield proved to be ineffective and the VC thereafter simply uplifted the mines and re-used them against the Australians and New Zealanders. Meanwhile, with the war continuing to escalate following further American troop increases, 1 ATF was heavily reinforced. A third infantry battalion, 3rd Battalion, Royal Australian Regiment, arrived in December 1967. The New Zealand contribution also increased with a second infantry company added also in December 1967. Whisky Company RNZIR was initially attached to 3 RAR and then came under operational control of 2 RAR, as with Victor Company. In February 1968 the Australian government sent two troops of Centurion tanks from its 1st Armoured Regiment to South Vietnam, each with four tanks, plus two tanks with the squadron headquarters. Two bulldozer tanks and two bridgelayer tanks were also committed. A third troop was created out of the headquarters tanks, and by August the squadron was brought up to its full strength of 26 tanks. Australian and New Zealand infantry would work very closely with these tank troops for the remainder of their time in Vietnam. Additional Iroquois helicopters were also added. In all a further 1,200 men were deployed, taking