The Battle of Gang Toi (8 November 1965) was fought during the Vietnam War between Australian troops and the Viet Cong. The battle was one of the first engagements between the two forces during the war and occurred when A Company, 1st Battalion, Royal Australian Regiment (1 RAR) struck a Viet Cong bunker system defended by Company 238 in the Gang Toi Hills, in northern Biên Hòa Province. It occurred during a major joint US-Australian operation codenamed Operation Hump, involving the US 173rd Airborne Brigade, to which 1 RAR was attached. During the latter part of the operation an Australian rifle company clashed with an entrenched company-sized Viet Cong force in well-prepared defensive positions. Meanwhile, an American paratroop battalion was also heavily engaged in fighting on the other side of the Đồng Nai River.
The Australians were unable to concentrate sufficient combat power to launch an assault on the position and consequently they were forced to withdraw after a fierce engagement during which both sides suffered casualties, reluctantly leaving behind two men who had been shot and could not be recovered due to heavy machine-gun and rifle fire. Although they were most likely dead, a battalion-attack to recover the missing soldiers was planned by the Australians for the next day, but this was cancelled by the American brigade commander due to rising casualties and the need to utilise all available helicopters for casualty evacuation. The bodies of the two missing Australian soldiers were subsequently recovered more than 40 years later, and were returned to Australia for burial.
Background
Military situation
Although the initial American commitment to the war in Vietnam had been limited to advice and materiel support, by 1964 there were 21,000 US advisors in South Vietnam. However, with the Army of the Republic of Vietnam (ARVN) weakened by successive defeats at the hands of the communists, the South Vietnamese government faltering, and Saigon threatened with a major offensive, the situation led to a significant escalation of the war in 1965, with a large-scale commitment of US ground troops under the command of General William Westmoreland. At first the Americans had adopted a cautious strategy, applied to the strictly limited role of base defence by US Marine units. This was abandoned in April 1965, and replaced by a new "enclave strategy" of defending key coastal population centres and installations. This strategy required the introduction of nine additional US battalions, or 14,000 troops, to bring the total in Vietnam to 13. Allied nations of the Free World Military Assistance Forces were expected to contribute another four battalions.
Westmoreland planned to develop a series of defensive positions around Saigon before expanding operations to pacify the South Vietnamese countryside and as a result a number of sites close to Viet Cong dominated areas were subsequently chosen to be developed into semi-permanent divisional-level bases. Such areas included Dĩ An which was intended to become the headquarters of the US 1st Infantry Division, while the US 25th Infantry Division would be based in the vicinity of Củ Chi. However, large-scale military operations to clear the intended base areas had to wait until the dry season. Yet the allied enclave strategy proved only transitory and further setbacks led to additional troop increases to halt the losing trend. With the situation reaching a crisis point during the Viet Cong wet season offensive in June 1965, Westmoreland requested further reinforcement and US and allied forces increased to 44 battalions which would be used to directly bolster the ARVN.
Australia's growing involvement in Vietnam reflected the American build-up. In 1963, the Australian government had committed a small advisory team, known as the Australian Army Training Team Vietnam (AATTV), to help train the South Vietnamese forces. However, in June 1965 the decision to commit ground troops was made, and the 1st Battalion, Royal Australian Regiment—originally commanded by Lieutenant Colonel Ivan 'Lou' Brumfield—was dispatched. Supporting 1 RAR was the 1 Troop, A Squadron, 4th/19th Prince of Wales's Light Horse equipped with M113 armored personnel carriers, artillery from the 105th Field Battery, Royal Australian Artillery and 161st Battery, Royal New Zealand Artillery, and 161st Reconnaissance Flight operating Cessna 180s and Bell H-13 Sioux light observation helicopters; in total 1,400 personnel. The Australian units and New Zealand artillery were attached to the US 173rd Airborne Brigade under the command of Brigadier General Ellis W. Williamson in Biên Hòa and operated throughout the III Corps Tactical Zone (III CTZ) to help establish the Biên Hòa–Vũng Tàu enclave. Although logistics and resupply were primarily provided by the Americans, a small logistic unit—1st Australian Logistics Company—was situated at Bien Hoa airbase. Unlike later Australian units that served in Vietnam, which included conscripts, 1 RAR was manned by regular personnel only.
Attached to US forces, 1 RAR was primarily employed in search and destroy operations using the newly developed doctrine of airmobile operations, utilising helicopters to insert light infantry and artillery into an area of operations, and to support them with aerial mobility, fire support, casualty evacuation, and resupply. The battalion commenced operations in late June 1965 and initially focussed on defeating the Viet Cong's wet season offensive. During this time US 173rd Brigade, including 1 RAR, conducted a number of operations into War Zone D—a major communist base area at the junction of Phước Long, Long Khánh, Biên Hòa and Bình Dương provinces—as well as in the Iron Triangle in November.
Prelude
Opposing forces
By late 1965 the junction of the Bé and Đồng Nai rivers had become a major communist staging area for men, equipment, and supplies for units based around Saigon and the Mekong Delta. Communist communications and resupply routes between War Zone C and D also met in this area. Westmoreland planned to use the US 173rd Airborne Brigade to keep the Viet Cong off balance and to target their base areas, and consequently a search-and-destroy operation codenamed "Operation Hump" was planned. Operation Hump marked the half-way point in the twelve-month tour of duty of the 173rd Airborne Brigade and was named accordingly. The concept of operations envisioned 1 RAR and the US 1st Battalion, 503rd Infantry Regiment being inserted by helicopter during an airmobile operation into War Zone D, in an area about north-east of the Bien Hoa Air Base. The Australian and American area of operations (AO) was to be separated by the Đồng Nai River, with 1 RAR to deploy into a landing zone (LZ) to the south, while the 1/503rd would conduct a helicopter assault onto a LZ northwest of the Đồng Nai and Bé rivers. Meanwhile, the 173rd Airborne Brigade's second battalion—2nd Battalion, 503rd Infantry Regiment—would be left to defend Bien Hoa Air Base.
The area was thought to be a Viet Cong stronghold and American intelligence initially identified Q762 Main Force Regiment and D800 Main Force Battalion as being nearby. However, unknown to the allied force, the Viet Cong 9th Division had likely received forewarning of the operation and had deployed one of its most experienced regiments, supported by a number of local force battalions, determined for a test of allied strength. The 271 Main Force Regiment (also known as Q761 Main Force Regiment) subsequently took up defensive positions in the area, while the communist U1 headquarters protected by Company 238, was situated on the plateau atop the Gang Toi Hills in an area which formed part of 1 RAR's objective. U1 was responsible for co-ordinating the Viet Cong regional defence against the Bien Hoa air base and for developing anti-government resistance and had been tasked with rebuilding the covert organisation in Biên Hòa city and the surrounding villages up to the Đồng Nai, as well as re-establishing the link between Biên Hòa city and War Zone D, and for planning and executing attacks against the air base itself. Yet having relocated to the rainforest two months earlier, its presence was also unknown to the Australians and Americans. Regardless, A Company 1 RAR was scheduled to conduct a search of the plateau on the fourth day of the operation.
Battle
Insertion and patrolling, 5–7 November 1965
On 5 November 1 RAR began the routine search-and-destroy operation, inserting by helicopter south of the Đồng Nai River at 08:00, while the 1/503rd was inserted onto LZ King north-west of the Đồng Nai and Bé rivers at 11:00. The operation started badly for the Australians and Americans with the fly-in delayed. Despite a lengthy preparation by fire, a large Viet Cong force had been observed in the vicinity of LZ Queen prior to the insertion of the lead Australian rifle company—D Company under the command of Captain Peter Rothwell. The escorting helicopter gunships began taking small arms fire as they attempted to provide suppressing fire and Rothwell made the decision to activate the alternate landing zone to the north-east, LZ Princess. D Company was subsequently inserted safely and swept back to LZ Queen, securing it for the remainder of the battalion. By mid-morning 1 RAR occupied LZ Queen, with the 105 mm L5 pack howitzers of 105 Field Battery also flying in to provide direct support. Augmenting the Australian gunners, the US 3/319 Artillery Battalion and 161st Battery, Royal New Zealand Artillery occupied FSB Ace further south.
The scheme of manoeuvre adopted by 1 RAR dictated that each company undertake a dispersed patrol program in their own tactical area of responsibility, a fact which would allow them to search more ground, but limit their ability to concentrate combat power in the event of contact. A Company, under Major John Healy, patrolled east; B Company moved north along the Bé River to Xóm Xoài, while D Company patrolled south. C Company remained at LZ Queen to protect 105 Field Battery which had established a fire support base (FSB). Over the next two days the Australians patrolled relentlessly through the leech-infested swamps and dense jungle. At midday on 6 November A Company received two mortar rounds which failed to do any damage, but marked the start of a series of minor clashes. A Company had a number of contacts during this time, with the Australians killing a Viet Cong scout for the loss of two wounded in one skirmish. A further contact soon after resulted in two more Viet Cong killed and one wounded. Intelligence gained from these incidents indicated the presence of a Viet Cong Main Force Regiment in the area, while documents recovered contained plans for attacks on ARVN outposts near Bien Hoa Air Base.
By nightfall on 7 November, despite the earlier contacts, no major actions had occurred in the Australian AO. With the rifle companies now several kilometres apart, A Company had patrolled into a network of well used roads and tracks. Healy's men spent the night astride the tracks and would resume patrolling the following day along a track which led to Hill 82. Meanwhile, although unknown to them at the time, the US 1/503rd Battalion across the Đồng Nai River had patrolled to within of a major Viet Cong bunker system sited on two spur lines in the vicinity of Hill 65.
Hill 82, 8 November 1965