|Active||1 November 1917-1918|
|Part of||British Army|
|Nov. 1917-May 1918||Gen. William Birdwood|
|Ceremonial chief||Maj. Gen. John Monash|
The Australian Corps was a World War I army corps that contained all five Australian infantry divisions serving on the Western Front. It was the largest corps fielded by the British Empire army in France. Formed on 1 November 1917, the corps replaced I Anzac Corps while II Anzac Corps, which contained the New Zealand Division, became the British XXII Corps.
Following the hard fighting of 1917, where the Australian divisions suffered heavily at Bullecourt, Messines and the Third Battle of Ypres, the Australian Imperial Force (AIF) was facing a manpower crisis. One referendum for conscription had already failed and another would be defeated on 1 December 1917. Voluntary recruitment was declining. Plans to form a 6th Australian Division were scrapped and the incomplete formation was disbanded. To make up the numbers, it was proposed to disband the Australian 4th Division, numerically the weakest, but this was strongly resisted by the members of the AIF.
General William Birdwood, commander of the AIF, suggested that, in forming the Australian Corps, the weakest division could serve as a depot, providing reserves for the fighting divisions. Field Marshal Douglas Haig, commander of the British Expeditionary Force, accepted this proposal. He had originally resisted combining the five Australian divisions into a single corps as he considered it too unwieldy.
The Australian nature of the corps was enhanced by the attachment of No. 3 Squadron AFC plus Australian siege artillery batteries. It was also considered appropriate to appoint Australian officers to all senior command positions. However, Birdwood remained in command of the corps.
General Hubert Gough was dismissed from command of the British Fifth Army following its failure to withstand the German Spring Offensive of 1918. When Haig decided to reform the Fifth Army, he offered its command to Birdwood who accepted. This paved the way for an Australian to assume command of the corps, the highest field command held by an Australian in the war. The two candidates were Major General Cyril Brudenell White (Birdwood's chief-of-staff) and Major General John Monash (commander of the 3rd Division). Monash, who was senior, had experience commanding troops in battle and was favoured by Haig and Birdwood, got the post in May 1918. The Australian Corps was used extensively throughout the Hundred Days Offensive during which it achieved great success.
The 4th Division saw little rest in its role as the "depot". In December 1917 it was moved into reserve near Péronne following the German counter-attack in the Battle of Cambrai (1917). In January 1918, the division was returned to the front line south of Ypres as Haig acquiesced to French demands to take over more of the front. From this time until the Australians were withdrawn from fighting in early October, all divisions of the corps saw nearly continuous action. Rather than disbanding entire divisions, any consolidation of strength was made under the British system of reducing brigades from four battalions to three.
- Edmonds, J. OH 1918 II, p. 30, fn 2.
- Volume V - The Australian Imperial Force in France: December 1917 - May 1918, C.E.W Bean, 1937
- Volume VI - The Australian Imperial Force in France: May 1918 - the Armistice, C.E.W Bean, 1942
- Fleming, Robert (2012) "The Australian Army in World War I". Osprey Publishing, ISBN 184908632X.
- Edmonds, J.E. (1937). Military Operations France and Belgium, 1918; March–April: Continuation of the German Offensives (IWM-Battery Press 1995 ed.). London: Macmillan. ISBN 0-89839-223-3.
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