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| Australian 5th Division | |
|---|---|
| Unit name | 5th Division |
| Dates | 1916–1919; 1939–1945 |
| Country | Australia |
| Branch | Australian Army |
| Type | Infantry |
| Size | Division |
| Command structure | I Anzac Corps; ANZAC Corps |
| Notable commanders | John Monash; James McCay; Leslie Morshead; Thomas Blamey |
Australian 5th Division was an infantry division of the Australian Army raised for service in both the First World War and the Second World War. Formed in 1916, it served on the Western Front after deployment from Egypt and Gallipoli, and was re-formed in 1939 to fight in the North African campaign, the Battle of Greece, the Battle of Crete and the Syria–Lebanon campaign. The division played roles alongside formations from the British Army, the New Zealand Expeditionary Force, the Indian Army and the Free French Forces.
The division was constituted in early 1916 following the expansion of the Australian Imperial Force after the Gallipoli Campaign and the evacuation from Anzac Cove, drawing troops from veteran battalions that had served under commanders such as William Birdwood and John Monash. Initial organization paralleled British practice established by the War Office and incorporated brigades transferred from the 2nd Division and newly raised units influenced by lessons from the Battle of Loos and the Somme Offensive. Training for the fledgling division occurred in the Suez Canal zone and at camps near Tel el Kebir under the supervision of staff officers with experience from the Middle Eastern theatre.
After formation, the division moved to the Western Front in mid-1916, entering the line during the Battle of the Somme sector and later participating in major operations including the Battle of Messines and the Third Battle of Ypres. Under commanders who coordinated with corps leaders from the British Expeditionary Force, the division fought in trench warfare characterized by engagements at Pozières and Bullecourt influenced by artillery tactics developed during the Battle of Arras. In 1918 it took part in defensive actions during the German Spring Offensive and the subsequent Hundred Days Offensive, cooperating with units from the Royal Flying Corps and later the Royal Air Force for close air support, culminating in advances near Amiens and the push towards the Hindenburg Line alongside formations of the Canadian Corps and the New Zealand Division.
Following demobilization in 1919, the division was disbanded as part of the wider reduction of the Australian Imperial Force, while Australia moved to a peacetime militia structure influenced by debates in the Commonwealth Parliament and defense planning shaped by figures such as Sir Robert Menzies and service leaders who assessed lessons from Gallipoli and the Western Front. During the 1920s and 1930s many veteran officers and non-commissioned officers influenced reorganizations within the Citizen Military Forces, with doctrine debates referencing experiences of commanders like Brudenell White and the reforms advocated by proponents of mechanization observed in studies of the Interwar period among the British Army and French Army.
Re-raised after the outbreak of the Second World War in 1939, the division embarked for the Middle East in 1940 as part of the I Australian Corps and engaged in the Syria–Lebanon campaign against Vichy French forces, coordinating with the Free French Forces and elements of the British Indian Army. It later fought in the North African campaign including actions during the Siege of Tobruk and operations connected to the Operation Crusader timeframe, confronting units of the German Afrika Korps led by Erwin Rommel and elements of the Italian Army. Detached elements participated in the Battle of Greece and the Battle of Crete, experiencing evacuation operations alongside ships of the Royal Navy and air cover from the Royal Air Force during the rapid German Blitzkrieg-style assault. Throughout these campaigns the division cooperated with allied corps and adapted to mobile warfare lessons evident in campaigns such as Operation Compass and the wider Mediterranean operations.
After the conclusion of hostilities in 1945 the division underwent demobilization, with personnel returning to civilian life amid national postwar reconstruction overseen by governments including administrations of Ben Chifley and later Robert Menzies. The reduction of the Australian Military Forces and the return to a peacetime order led to the disbandment of the division as priority shifted to occupation duties, the establishment of the Australian Regular Army, and commitments to treaties such as the postwar security arrangements that would involve the United Nations and regional alliances influenced by ANZUS debates. Former division members were absorbed into other formations or released to the Returned and Services League of Australia and civilian employment.
The division's legacy is preserved in regimental histories, memorials and commemorative events that honor campaigns fought at locations including Anzac Cove, Pozières, Amiens, Crete and Syria. Museums such as the Australian War Memorial, unit museums, and collections of the National Archives of Australia house records, diaries and battle honours, while associations of veterans and descendants maintain memorial rolls and host commemorations on days tied to battles like ANZAC Day and anniversaries of the Armistice of 11 November 1918. Scholarly works and biographies of commanders feature in university research libraries and publications from presses that archive operational studies alongside comparative analyses including studies of the British Expeditionary Force, the Canadian Corps, and other Commonwealth formations. Contemporary studies reference the division’s adaptation from trench warfare to manoeuvre operations as part of broader examinations of Australian military doctrine in the 20th century.