Portal:Military history of Australia

Elwyn Roy King, DSO, DFC (13 May 1894 – 28 November 1941) was a fighter ace in the Australian Flying Corps (AFC) during World War I. He achieved twenty-six victories in aerial combat, making him the fourth highest-scoring Australian pilot of the war, and second only to Harry Cobby in the AFC. A civil pilot and engineer between the wars, he served in the Royal Australian Air Force (RAAF) from 1939 until his death.

Born in Bathurst, New South Wales, King initially saw service as a lighthorseman in Egypt in 1916. He transferred to the AFC as a mechanic in January 1917, and was subsequently commissioned as a pilot. Posted to No. 4 Squadron, he saw action on the Western Front flying Sopwith Camels and Snipes. He scored seven of his "kills" in the latter type, more than any other pilot. His exploits earned him the Distinguished Flying Cross, the Distinguished Service Order, and a mention in despatches. Returning to Australia in 1919, King spent some years in civil aviation before co-founding a successful engineering business. He joined the RAAF following the outbreak of World War II and held several training commands, rising to the rank of group captain shortly before his sudden death in November 1941 at the age of forty-seven. (Full article...)

Clare Grant Stevenson, AM, MBE (18 July 1903 – 22 October 1988) was the inaugural Director of the Women's Auxiliary Australian Air Force (WAAAF), from May 1941 to March 1946. As such, she was described in 2001 as "the most significant woman in the history of the Air Force". Formed as a branch of the Royal Australian Air Force (RAAF) in March 1941, the WAAAF was the first and largest uniformed women's service in Australia during World War II, numbering more than 18,000 members by late 1944 and making up over thirty per cent of RAAF ground staff.

Born and educated in Victoria, Stevenson was an executive with the Berlei company when she was appointed Director WAAAF. Initially ranked squadron officer, she rose to become group officer by April 1942. Stevenson resumed her civilian career following her discharge from the Air Force in 1946. Long active in adult education and social welfare, she helped form aid organisations including the Carers Association of New South Wales (now Carers NSW) after retiring from Berlei in 1960. Stevenson was appointed a Member of the Order of the British Empire and a Member of the Order of Australia for her services to the community and to female veterans. (Full article...)

HMAS Melbourne (R21) was a Majestic-class light aircraft carrier operated by the Royal Australian Navy (RAN) from 1955 until 1982, and was the third and final conventional aircraft carrier to serve in the RAN. Melbourne was the only Commonwealth naval vessel to sink two friendly warships in peacetime collisions.

Melbourne was laid down for the Royal Navy as the lead ship of the Majestic class in April 1943, and was launched as HMS Majestic (R77) in February 1945. At the end of the Second World War, work on the ship was suspended until she was purchased by the RAN in 1947. At the time of purchase, it was decided to incorporate new aircraft carrier technologies into the design, making Melbourne the third ship to be constructed with an angled flight deck. Delays in construction and integrating the enhancements meant that the carrier was not commissioned until 1955. (Full article...)

General Sir Henry George Chauvel, GCMG, KCB (16 April 1865 – 4 March 1945) was a senior officer of the Australian Imperial Force who fought at Gallipoli and during the Sinai and Palestine Campaign in the Middle Eastern theatre of the First World War. He was the first Australian to attain the rank of lieutenant general and later general, and the first to lead a corps. As commander of the Desert Mounted Corps, he was responsible for one of the most decisive victories and fastest pursuits in military history.

The son of a grazier, Chauvel was commissioned as a second lieutenant in the Upper Clarence Light Horse, a unit organised by his father, in 1886. After the family moved to Queensland he was commissioned as a second lieutenant in the Queensland Mounted Infantry in 1890, and saw service during the 1891 Australian shearers' strike. He became a regular officer in 1896, and went to the United Kingdom as part of the Queensland contingent for the 1897 Diamond Jubilee of Queen Victoria. In 1899 he commanded one of two companies of Queensland Mounted Infantry that were Queensland's initial contribution to the Boer War. After the war, he was closely involved with the training of the Australian Light Horse. (Full article...)

No. 1 Flying Training School (No. 1 FTS) is a school of the Royal Australian Air Force (RAAF). It is one of the Air Force's original units, dating back to the service's formation in 1921, when it was established at RAAF Point Cook, Victoria. By the early 1930s, the school comprised training, fighter, and seaplane components. It was re-formed several times in the ensuing years, initially as No. 1 Service Flying Training School (No. 1 SFTS) in 1940, under the wartime Empire Air Training Scheme. After graduating nearly 3,000 pilots, No. 1 SFTS was disbanded in late 1944, when there was no further requirement to train Australian aircrew for service in Europe.

The school was re-established in 1946 as No. 1 FTS at RAAF Station Uranquinty, New South Wales, and transferred to Point Cook the following year. Under a restructure of flying training to cope with the demands of the Korean War and Malayan Emergency, No. 1 FTS was re-formed in 1952 as No. 1 Applied Flying Training School (No. 1 AFTS); it moved to RAAF Base Pearce, Western Australia, in 1958. For much of this period the school was also responsible for training the RAAF's air traffic controllers. Its pilot trainees included Army, Navy, and foreign students as well as RAAF personnel. The RAAF's reorganisation of aircrew training in the early 1950s had led to the formation at Uranquinty of No. 1 Basic Flying Training School (No. 1 BFTS), which transferred to Point Cook in 1958. In 1969, No. 1 AFTS was re-formed as No. 2 Flying Training School and No. 1 BFTS was re-formed as No. 1 FTS. Rationalisation of RAAF flying training resulted in the disbandment of No. 1 FTS in 1993. (Full article...)

The Battle of Kaiapit was an action fought in 1943 between Australian and Japanese forces in New Guinea during the Markham and Ramu Valley – Finisterre Range campaign of World War II. Following the landings at Nadzab and at Lae, the Allies attempted to exploit their success with an advance into the upper Markham Valley, starting with Kaiapit. The Japanese intended to use Kaiapit to threaten the Allied position at Nadzab, and to create a diversion to allow the Japanese garrison at Lae time to escape.

The Australian 2/6th Independent Company flew in to the Markham Valley from Port Moresby in 13 USAAF C-47 Dakotas, making a difficult landing on a rough airstrip. Unaware that a much larger Japanese force was also headed for Kaiapit, the company attacked the village on 19 September to secure the area so that it could be developed into an airfield. The company then held it against a strong counter-attack. During two days of fighting the Australians defeated a larger Japanese force while suffering relatively few losses. (Full article...)

Air Vice Marshal Frank Headlam, CB, CBE (15 July 1914 – 23 December 1976) was a senior commander in the Royal Australian Air Force (RAAF). Born and educated in Tasmania, he joined the RAAF as an air cadet in January 1934. He specialised in flying instruction and navigation before the outbreak of World War II. In April 1941, he became commanding officer of No. 2 Squadron, which operated Lockheed Hudsons. The squadron was deployed to Dutch Timor in December, and saw action against Japanese forces in the South West Pacific. After returning to Australia in February 1942, Headlam held staff appointments and training commands, finishing the war a group captain.

Headlam served as Officer Commanding North-Western Area in 1946, and as Director of Training from 1947 to 1950. In 1950–51, during the Malayan Emergency, he was stationed at Singapore as commander of No. 90 (Composite) Wing and, later, RAF Tengah. He twice served as acting Air Member for Personnel, in 1957 and 1959–60, receiving appointment as a Commander of the Order of the British Empire in 1958. Promoted air vice marshal, he successively held the positions of Air Officer Commanding (AOC) Operational Command in 1961–62, AOC No. 224 Group RAF from 1962 to 1965 during the Indonesia–Malaysia Konfrontasi, Deputy Chief of the Air Staff in 1965–66, and AOC Support Command in 1966–67. He was appointed a Companion of the Order of the Bath in 1965. Following a posting to London as Head of the Australian Joint Services Staff from 1968 to 1971, he retired from the Air Force and died in Melbourne five years later. (Full article...)

The Battle of Arawe (also known as Operation Director) was fought between Allied and Japanese forces during the New Britain campaign of World War II. The battle formed part of the Allied Operation Cartwheel and was a diversion before a larger landing at Cape Gloucester in late December 1943. The Japanese military was expecting an Allied offensive in western New Britain and was reinforcing the region at the time of the Allied landing in the Arawe area on 15 December 1943. The Allies secured Arawe after about a month of intermittent fighting with the outnumbered Japanese force.

Initial Allied goals for the landing at Arawe included securing a base for American PT boats and diverting Japanese forces away from Cape Gloucester. The PT boat base was subsequently deemed unnecessary and not built. Only a small Japanese force was stationed at Arawe at the time, although reinforcements were en route. The main Allied landing on 15 December was successful despite a failed subsidiary landing and problems coordinating the landing craft. American forces quickly secured a beachhead and dug in. Japanese air units made large-scale raids against the Arawe area in the days after the landing, and in late December Imperial Japanese Army (IJA) troops unsuccessfully counterattacked the American force. In mid-January 1944 the American force, reinforced with additional infantry and tanks, launched a brief offensive that pushed the Japanese back. The Japanese units at Arawe withdrew from the area towards the end of February as part of a general retreat from western New Britain. (Full article...)

Lieutenant General Sir Alwyn Ragnar Garrett, KBE, CB (12 February 1900 – 4 November 1977) was a senior commander in the Australian Army. He served as Chief of the General Staff (CGS) from 1958 to 1960.

Born in Western Australia, Garrett graduated from the Royal Military College, Duntroon, in 1921. He was adjutant and quartermaster in several regiments of the Australian Light Horse before undertaking staff training in England, which he completed just as the Second World War broke out. Garrett joined the Second Australian Imperial Force soon afterwards, and commanded the 2/31st Battalion in England before seeing action with Australian brigades in Greece and Crete in 1941. Promoted to colonel the following year, he held senior positions with I Corps in New Guinea and II Corps on Bougainville in 1944–1945. He was appointed a Commander of the Order of the British Empire for his staff work. (Full article...)

Western Area Command was one of several geographically based commands raised by the Royal Australian Air Force (RAAF) during World War II. It was formed in January 1941, and controlled RAAF units located in Western Australia. Headquartered in Perth, Western Area Command was responsible for air defence, aerial reconnaissance and protection of the sea lanes within its boundaries. Its aircraft conducted anti-submarine operations throughout the war, and attacked targets in the Dutch East Indies during the Borneo campaign in 1945.

The area command continued to operate after the war, but its assets and staffing were much reduced. Its responsibilities were subsumed in February 1954 by the RAAF's new functional commands: Home (operational), Training, and Maintenance Commands. Western Area headquarters was disbanded in November 1956. (Full article...)

Lieutenant General Henry John Coates, AC, MBE (28 December 1932 – 11 June 2018) was a senior officer in the Australian Army who served as Chief of the General Staff from 1990 to 1992. After retiring from the army, he became an author and a visiting fellow at the Australian Defence Force Academy branch of the University of New South Wales, pursuing aspects of Australia's military history. (Full article...)

Major General Joseph Maria Gordon CB (19 March 1856 – 6 September 1929) was a senior officer in the British Army, later holding the position of Commandant of the South Australian Military Forces and serving in the Second Boer War in South Africa. Gordon subsequently held the position of Chief of the General Staff in the Australian Army before commanding a number of reserve formations during the First World War. Born in Jerez de la Frontera, Spain, he was the son of Carlos Pedro Gordon, of Scottish descent, and Elena Maria Prendergast, of Irish descent. He died in 1929. (Full article...)

The Chief of Army is the most senior appointment in the Australian Army, responsible to both the Chief of the Defence Force (CDF) and the Secretary, Department of Defence (SECDEF). The rank associated with the position is lieutenant general (3-star).

Lieutenant General Simon Stuart, the incumbent Chief of Army, has held the post since 2 July 2022. (Full article...)

Australia joined a U.S.-led coalition in the Iraq War. Declassified documents reveal that the decision to go to war was taken primarily with a view to enhancing its alliance with the United States.

The Howard government supported the disarmament of Iraq during the Iraq disarmament crisis. Australia later provided one of the four most substantial combat force contingents during the 2003 invasion of Iraq, under the operational codename Operation Falconer. Part of its contingent were among the first forces to enter Iraq after the official "execute" order. The initial Australian force consisted of three Royal Australian Navy ships, a 500-strong special forces task group, two AP-3C Orion maritime patrol aircraft, two B707 Air-to-Air refuelling aircraft, C-130 Hercules transport aircraft and No. 75 Squadron RAAF (which included 14 F/A-18 Hornet fighters). Combat forces committed to Operation Falconer for the 2003 Invasion were withdrawn during 2003. Under the name Operation Catalyst, Australian combat troops were redeployed to Iraq in 2005, however, and assumed responsibility for supporting Iraqi security forces in one of Iraq's southern provinces. These troops began withdrawing from Iraq on 1 June 2008 and were completely withdrawn by 28 July 2009. (Full article...)

Lieutenant General Sir Mervyn Francis Brogan, KBE, CB (10 January 1915 – 8 March 1994) was a senior officer in the Australian Army who served as Chief of the General Staff from 1971 to 1973.

A 1935 graduate of the Royal Military College, Duntroon, where he was the Corps Sergeant Major and was awarded the Sword of Honour, and of the University of Sydney, where he earned a Bachelor of Engineering degree, Brogan served in the Second World War on the staff of New Guinea Force during New Guinea Campaign, and as an observer with the British Army during the Western Allied invasion of Germany. After the war he was commandant and chief instructor at the School of Military Engineering during the 1949 Australian coal strike, and, as Director of Military Training, reopened the Land Warfare Centre at Canungra in 1954. When he was appointed the Chief of the General Staff in 1971, he was the first occupant of that position to possess a university degree. He presided over the withdrawal of Australian troops from the Vietnam War, the ending of the National Service scheme, and the consequent reduction of the size of the Army, and sweeping organisational changes. (Full article...)

The Australian Flying Corps (AFC) was the branch of the Australian Army responsible for operating aircraft during World War I, and the forerunner of the Royal Australian Air Force (RAAF). The AFC was established in 1912, though it was not until 1914 that it began flight training.

In 1911, at the Imperial Conference held in London, it was decided that aviation should be developed by the national armed forces of the British Empire. Australia became the first member of the Empire to follow this policy. By the end of 1911, the Army was advertising for pilots and mechanics. During 1912, pilots and mechanics were appointed, aircraft were ordered, the site of a flying school was chosen and the first squadron was officially raised. On 7 March 1913, the government officially announced formation of the Central Flying School (CFS) and an "Australian Aviation Corps", although that name was never widely used. (Full article...)

The Australian Naval and Military Expeditionary Force (AN&MEF) was a small volunteer force of approximately 2,000 men, raised in Australia shortly after the outbreak of World War I to seize and destroy German wireless stations in German New Guinea in the south-west Pacific. The German wireless installations were ordered to be destroyed because they were used by Vizeadmiral (Vice Admiral) Maximilian von Spee's East Asia Squadron of the Imperial German Navy, which threatened merchant shipping in the region. Following the capture of German possessions in the region, the AN&MEF provided occupation forces for the duration of the war. New Zealand provided a similar force for the occupation of German Samoa. (Full article...)

The New South Wales Marine Corps was a battalion-sized unit of the British Marine Forces created to guard convicts aboard the First Fleet to Australia, and to preserve "subordination and regularity" in the colony of New South Wales. Established in 1786, the unit served in New South Wales from 1788 to 1792, and was instrumental in establishing the colony's rule of law. Study of the complete New South Wales Marine complement indicates they were chosen from the Plymouth and Portsmouth Divisions, with only one exception. Beginning with guards arriving with the 2nd and 3rd fleets but officially with the arrival of HMS Gorgon on 22 September 1791, the New South Wales Marines were relieved by a newly formed British Army regiment of foot, the New South Wales Corps. (Full article...)

Operation Okra was the Australian Defence Force (ADF) contribution to the military intervention against the Islamic State. The deployed forces formed part of Joint Task Force 633 in the Middle East. The operation commenced on 31 August 2014, and its initial stated aim was to combat ISIL threats in Iraq. In September 2015, the Australian airstrikes were extended to Syria. In June 2017, flights in Syria were temporarily halted in response to American forces shooting down a Syrian Air Force jet, before later being resumed.

Operation Okra concluded in December 2024. (Full article...)

The Hobart coastal defences are a network of now defunct coastal batteries, some of which are inter-linked with tunnels, that were designed and built by British colonial authorities in the nineteenth century to protect the city of Hobart, Tasmania, from attack by enemy warships. During the nineteenth century, the port of Hobart Town was a vital re-supply stop for international shipping and trade, and therefore a major freight hub for the British Empire. As such, it was considered vital that the colony be protected. In all, between 1804 and 1942 there were 12 permanent defensive positions constructed in the Hobart region.

Prior to Australian Federation, the island of Tasmania was a colony of the British Empire, and as such was often at war with Britain's enemies and European rivals, such as France and later Russia. The British had already established the colony of Sydney at Port Jackson in New South Wales in 1788, but soon began to consider the island of Tasmania as the potential site of a useful second colony. It was an island, cut off from the mainland of Australia and isolated geographically, making it ideal for a penal colony, and was rich in timber, a resource useful to the Royal Navy. In 1803, the British authorities decided to colonise Tasmania, and to establish a permanent settlement on the island that was at the time known as Van Diemen's Land, primarily to prevent the French from doing so. During this period tensions between Great Britain and France remained high. The two nations had been fighting the French Revolutionary Wars with each other through much of the 1790s, and would soon be engaging each other again in the Napoleonic Wars. (Full article...)

The Russian Civil War (1917–1921) began after the provisional government collapsed and the Bolshevik party assumed power in October 1917. The principal fighting occurred between the Bolshevik Red Army and the forces of the White Army, a group of loosely allied anti-Bolshevik forces. During the war several foreign armies took part, mostly fighting against the Red Army—including the Western allies—and many foreign volunteers fought for both sides. Other nationalist and regional political groups also participated in the war, including the Ukrainian nationalist Green Army, the Ukrainian anarchist Insurgent Army and Black Guards, and warlords such as Ungern von Sternberg. Despite some pressure from Britain, the Australian Prime Minister, William Hughes, had refused to commit forces to Russia following the end of World War I in 1918.

Although no Australian units were engaged in operations, many individuals did become involved through service with the British Army during the North Russia Campaign. They served in many roles, including as advisors to White Russian units as part of the North Russian Expeditionary Force (NREF). About 150 men of the Australian Imperial Force who were still in England awaiting repatriation following the end of World War I enlisted as infantry in the North Russia Relief Force (NRRF), where they were involved in several sharp battles. The Royal Australian Navy was also involved, the destroyer HMAS Swan being briefly engaged in an intelligence-gathering mission in the Black Sea in late 1918 on behalf of the British military mission then advising the White Russian general, Anton Denikin. Several Australians acted as advisers to this mission as well, and others served as advisers with Admiral Aleksandr Kolchak in Siberia. (Full article...)

Robert Alexander Little, DSO & Bar, DSC & Bar (19 July 1895 – 27 May 1918), a World War I fighter pilot, is generally regarded as the most successful Australian flying ace, with an official tally of forty-seven victories. Born in Victoria, he travelled to England in 1915 and learned to fly at his own expense before joining the Royal Naval Air Service (RNAS). Posted to the Western Front in June 1916, he flew Sopwith Pups, Triplanes and Camels with No. 8 Squadron RNAS, achieving thirty-eight victories within a year and earning the Distinguished Service Order and Bar, the Distinguished Service Cross and Bar, and the French Croix de guerre. Rested in July 1917, he volunteered to return to the front in March 1918 and scored a further nine victories with No. 3 Squadron RNAS (later No. 203 Squadron RAF) before he was killed in action on the night of 27 May, aged twenty-two. (Full article...)

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. (Full article...)

Northern Command was one of several geographically based commands raised by the Royal Australian Air Force (RAAF) during World War II. Established in April 1944, it evolved from No. 9 Operational Group, which had been the RAAF's primary mobile formation in the South West Pacific theatre since September 1942, but had lately become a garrison force in New Guinea. Northern Command was headquartered initially at Milne Bay and then, from August 1944, in Madang. It conducted operations in New Guinea, New Britain, and Bougainville until the end of the war. Re-designated Northern Area in December 1945, it was headquartered in Port Moresby from March 1946 and disbanded in February 1947. (Full article...)

The 1st Parachute Battalion was a parachute infantry battalion of the Australian Army. Raised for service during the Second World War, it was formed in early 1943 from volunteers for airborne training. Despite achieving a high level of readiness, the battalion did not see action during the war and was disbanded in early 1946. (Full article...)

Frederick Birks, VC, MM (16 August 1894 – 21 September 1917) was a Welsh-born Australian First World War soldier and recipient of the Victoria Cross, the highest decoration for gallantry "in the face of the enemy" that can be awarded to members of the British and Commonwealth forces.

Born in Buckley, Flintshire, Birks served in the Royal Artillery for three years before emigrating to Australia in 1913. After serving as a non-commissioned officer during the landing at Gallipoli and the Battle of the Somme, Birks was commissioned as a second lieutenant on 4 May 1917. On 20 September, during the Battle of Passchendaele, while advancing in Glencorse Wood, Ypres, Birks, alongside a corporal, forced a garrison to surrender and captured sixteen men in another attack. His actions were later recognised with the Victoria Cross. The following day, Birks was killed by a shell while attempting to save some of his men. (Full article...)

The Battle of the Samichon River (24–26 July 1953) was fought during the final days of the Korean War between United Nations (UN) forces—primarily Australian and American—and the Chinese People's Volunteer Army (PVA). The fighting took place on a key position on the Jamestown Line known as "the Hook", and resulted in the defending UN troops, including the 2nd Battalion, Royal Australian Regiment (2 RAR) from the 28th British Commonwealth Brigade and the US 7th Marine Regiment, repulsing numerous assaults by the PVA 137th Division during two concerted night attacks, inflicting numerous casualties on the PVA with heavy artillery and small-arms fire. The action was part of a larger, division-sized PVA attack against the US 1st Marine Division, with diversionary assaults mounted against the Australians. With the peace talks in Panmunjom reaching a conclusion, the Chinese had been eager to gain a last-minute victory over the UN forces, and the battle was the last of the war before the official signing of the Korean armistice.

During the action, the PVA attempted to make a breakthrough to the Imjin River along the divisional boundary between the US 1st Marine Division and the 1st Commonwealth Division to turn the 1st Marine Division's flank. Yet with well-coordinated indirect fire from the divisional artillery, including the 16th Field Regiment, Royal New Zealand Artillery, and support from British Centurion tanks of the 1st Royal Tank Regiment, 2 RAR successfully thwarted both assaults, holding the Hook. UN sources estimated PVA casualties at 2,000 to 3,000 killed, with the majority of them inflicted by the New Zealand gunners. Meanwhile, on the left flank, US Marines endured the brunt of the attack, repelling the PVA onslaught with infantry and artillery. Only a few hours later, the armistice agreement was signed, ultimately ending the war. Both sides subsequently withdrew 2 kilometres (1.2 mi) within 72 hours to create the 4-kilometre (2.5 mi) Korean Demilitarised Zone. (Full article...)

No. 75 Wing was a Royal Australian Air Force (RAAF) wing that operated during World War II. It was formed in October 1943 at Townsville, Queensland, under North-Eastern Area Command. The wing soon deployed to Horn Island to take control of RAAF units based there and at Thursday Island and Cape York Peninsula. Responsible for air defence and maritime patrol in the Torres Strait, No. 75 Wing's flying units operated P-40 Kittyhawk fighters, Bristol Beaufort reconnaissance bombers, and A-31 Vengeance dive bombers. The wing was disbanded in August 1944. (Full article...)

No. 5 Airfield Construction Squadron (5ACS) was a Royal Australian Air Force (RAAF) construction squadron. The unit was first formed in July 1942 and served in the New Guinea Campaign and Borneo Campaign during World War II. The squadron was one of only a few RAAF airfield construction units to be retained at the end of the war, and formed part of Australia's contribution to the occupation of Japan from 1945 until it was disbanded in June 1949. 5ACS was re-raised in August 1951 and worked on several RAAF airfields in Australia. It also provided small detachments of engineers to support RAAF deployments to South Vietnam and Thailand during the Vietnam War. The squadron was the RAAF's only airfield construction unit from 1961 onward, and was disbanded in December 1974. (Full article...)

The Battle of Suoi Bong Trang (23–24 February 1966) was an engagement fought between US, Australian and New Zealand forces, and the Viet Cong and North Vietnamese Army during the Vietnam War. The battle occurred during Operation Rolling Stone, an American security operation to protect engineers building a tactically important road in the vicinity of Tan Binh, in central Binh Duong Province, 30 kilometres (19 mi) north-west of Bien Hoa airbase. During the fighting, soldiers from the US 1st Brigade, 1st Infantry Division and the 1st Battalion, Royal Australian Regiment (1 RAR), which had been attached for the operation, fought off a regimental-sized Viet Cong night assault. Repulsed by massed firepower from artillery and tanks, the Viet Cong suffered heavy casualties and were forced to withdraw by morning. After the attack, the Americans and Australians made no attempt to pursue the Viet Cong, focusing on securing the battlefield and evacuating their own casualties. The Viet Cong continued to harass the American sappers with occasional sniper and mortar fire, but these tactics proved ineffective, and the road was completed by 2 March. (Full article...)