The Battle of Long Tan took place on 18 August 1966 in Phước Tuy province, South Vietnam, during the Vietnam War between Viet Cong and North Vietnamese units from the Viet Cong 275th Regiment, possibly reinforced by at least one North Vietnamese battalion, and D445 Provincial Mobile Battalion, and Australian forces from D Company, 6th Battalion, Royal Australian Regiment (6 RAR). Although the Australians were heavily outnumbered and almost overwhelmed by the Viet Cong the battle ended in a decisive victory for them, establishing their dominance over the province. This perspective however sharply contrasts with competing interpretations in which the D445 Battalion had garnered strong political support in Phuoc Tay. Furthermore, the local D445 Battalion was redeployed northwards against the newly deployed 11th Armored Cavalry Taskforce a month later and so the true significance of the battle is called into question.
However, in the years since it was fought the intentions of the Viet Cong, in particular in mortaring the Australian base at Nui Dat on the night on 16/17 August, have been much debated. This has included the possibility that the Viet Cong had intended to attack and overwhelm Nui Dat, with the initial plan to mortar the base to draw a response force into an ambush after which the base would be attacked and captured, but that they had been prevented from doing so after clashing with D Company, 6 RAR. A second possibility was that they may have had the more limited aim of drawing D Company into an ambush to destroy it and secure a small victory over an isolated force. Finally, it was possible no ambush was planned at all, and that the Viet Cong had been moving on Nui Dat in regimental strength when they unexpectedly ran into D Company, resulting in an encounter battle. Later interviews conducted by an Australian veteran of the battle Terry Burstall, with commanders of the 275th Battalion and D445 Battalion including the battle commander and later Deputy Defense Minister Nguyen Thoi Bung indicate that mortaring was intended to draw out the 6 RAR out of their base, in which an ambush was to occur followed by a retreat before artillery and air support can be utilised, typical of the grab-by-the-belt tactic.
Background
The Battle of Long Tan (18 August 1966) took place in a rubber plantation near Long Tan, in Phước Tuy province, South Vietnam, during the Vietnam War. The action was fought between Australian forces and Viet Cong and North Vietnamese units after 108 men from D Company, 6th Battalion, Royal Australian Regiment (6 RAR) clashed with a force of 1,500 to 2,500 from the Viet Cong 275th Regiment, possibly reinforced by at least one North Vietnamese battalion, and D445 Provincial Mobile Battalion. The 1st Australian Task Force (1 ATF) had arrived between April and June 1966, constructing a base at Nui Dat. After two months it had moved beyond the initial requirements of establishing itself and securing its immediate approaches, beginning operations to open the province. Meanwhile, in response to the threat posed by 1 ATF the 275th Regiment was ordered to move against Nui Dat. For several weeks Australian signals intelligence (SIGINT) had tracked a radio transmitter moving westwards to a position just north of Long Tan; however, extensive patrolling failed to find the unit. At 02:43 on the night of 16/17 August, Viet Cong mortars, recoilless rifles (RCLs) and artillery heavily bombarded Nui Dat from a position to the east, before being engaged by counter-battery fire. The following morning B Company, 6 RAR departed Nui Dat to locate the firing points and the direction of the Viet Cong withdrawal. A number of weapon pits were subsequently found, as were the positions of the mortars and RCLs.
D Company took over the pursuit around midday on 18 August. At 15:40 the lead element, 11 Platoon, clashed with a Viet Cong squad and forced them to withdraw. Shortly after resuming the advance, at 16:08 the platoon came under small-arms and rocket-propelled grenade fire from a flank after drawing ahead of the other platoons and was isolated. Pinned down, they called for artillery support as a monsoon rain began, reducing visibility. Beginning as an encounter battle, heavy fighting ensued as the advancing battalions of the Viet Cong 275th Regiment attempted to encircle and destroy the Australians. After less than 20 minutes more than a third of 11 Platoon had become casualties, while the platoon commander was killed soon after. 10 Platoon moved up on the left in support but was repulsed. With D Company facing a much larger force, 12 Platoon tried to push up on the right at 17:15. Fighting off an attack on their right before pushing forward another they sustained increasing casualties after clashing with several groups moving around their western flank to form a cut-off prior to a frontal assault. Opening a path to 11 Platoon yet unable to advance further, they threw smoke to mark their location. Nearly out of ammunition, at 18:00 two UH-1B Iroquois from No. 9 Squadron RAAF arrived overhead to resupply D Company. Meanwhile, the survivors from 11 Platoon withdrew to 12 Platoon during a lull, suffering further losses. Still heavily engaged, both platoons then moved back to the company position covered by artillery.
By 18:10 D Company had reformed but was still in danger of being overrun. A Company, 6 RAR was dispatched in M113 armoured personnel carriers from 3 Troop, 1st APC Squadron to reinforce them. Meanwhile, B Company headquarters and one platoon were still returning to base and were also ordered to assist. Leaving Nui Dat at 17:55, the carriers moved east, crossing a swollen creek before encountering elements of D445 Battalion attempting to outflank D Company and assault it from the rear. The Viet Cong were caught by surprise as the cavalry crashed into their flank and with darkness falling they broke through, while B Company entered the position at 19:00. Arriving at a crucial point, the relief force turned the tide of the battle. The Viet Cong had been massing for another assault which would have likely destroyed D Company, yet the firepower and mobility of the armour broke their will, forcing them to withdraw. Continuing past D Company the relief force assaulted the Viet Cong, before moving back to the company position at 19:10. The artillery had been almost constant throughout and proved critical in ensuring the survival of D Company. A later interview with officers involved in the battle indicate some men of the D445 were killed while capturing two wounded Australians, with all having been killed in the barrage. By 19:15 the firing had ceased and the Australians waited for another attack. However, after no counter-attack occurred they prepared to withdraw west. With the dead and wounded loaded onto the carriers D Company left at 22:45, while B and A Company departed on foot. A landing zone was then established by the cavalry with the evacuation of the casualties finally completed after midnight. Forming a defensive position ready to repulse an expected attack they remained overnight, enduring the cold and heavy rain.
The Australians returned in strength the next day, sweeping the area and locating a large number of Viet Cong dead. Although initially believing they had suffered a major defeat, as the scale of the Viet Cong's losses were revealed it became clear they had won a significant victory. Two wounded Viet Cong were killed after they moved to engage the Australians, while three were captured. The bodies of the missing from 11 Platoon were also located. Two men had survived despite their wounds, having spent the night in close proximity to the Viet Cong as they attempted to evacuate their own casualties. Due to the likely presence of a sizeable force nearby the Australians remained cautious as they searched for the Viet Cong. Over the next two days they continued to clear the battlefield, uncovering more dead as they did so. Yet with 1 ATF lacking the resources to pursue the withdrawing force, the operation ended on 21 August. Heavily outnumbered but supported by strong artillery fire, D Company held off a regimental assault before a relief force of cavalry and infantry fought their way through and forced the Viet Cong to withdraw. Eighteen Australians were killed and 24 wounded, while Australian official reports claim the Viet Cong lost at least 245 dead which were found over the days that followed. Actual figures are in dispute, by both veterans of the Australian and North Vietnamese side, with allegations of body-count inflation in order to serve public-relations purposes. A decisive Australian victory, Long Tan proved a major local setback for the Viet Cong, indefinitely forestalling an imminent movement against Nui Dat and establishing the task force's dominance over the province. Although there were other large-scale encounters in later years, 1 ATF was not fundamentally challenged again.
Assessment Initial Australian hypotheses In the wake of the battle the Australians were left to speculate on the reason it occurred. One hypothesis was that the Viet Cong had intended to attack and overwhelm Nui Dat, with the initial plan to mortar the base to draw a response force into an ambush after which the base would be attacked and captured, but that they had been prevented from doing so after clashing with D Company. A second possibility was that they may have had the more limited aim of drawing D Company into an ambush to destroy it and secure a small victory over an isolated force. Finally, it was possible no ambush was planned at all, and that the Viet Cong had been moving on Nui Dat in regimental strength when they unexpectedly ran into D Company, resulting in an encounter battle. The evidence suggested they intended an attack on Nui Dat in some form, while the lack of prepared positions from which to mount an ambush made this unlikely. Brigadier David Jackson—Commander 1 ATF—believed the Viet Cong had been on their way to attack Nui Dat on the night of 18/19 August when D Company intercepted them and this was supported by information from a prisoner captured afterwards. They were carrying large quantities of ammunition and may have had sufficient strength to seriously damage the base, even if its defences were likely strong enough to withstand such an attack. Yet, from the earliest Jackson had felt the Viet Cong would have to engage 1 ATF in a major battle if they wished to retain control of Phuoc Tuy, and this interpretation fitted his previous thinking. In dispatching patrols east of Nui Dat following the mortar attack on 16/17 August Jackson seemingly reacted to his opponent's first move, and he may have allowed himself to be shaped into responding as the Viet Cong had intended.