I Anzac Corps
Encyclopedia
The I ANZAC Corps was a combined Australia
Australia
Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

n and New Zealand
New Zealand
New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

 army corps
Corps
A corps is either a large formation, or an administrative grouping of troops within an armed force with a common function such as Artillery or Signals representing an arm of service...

 that served during World War I
World War I
World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

.

It was formed in Egypt
Egypt
Egypt , officially the Arab Republic of Egypt, Arabic: , is a country mainly in North Africa, with the Sinai Peninsula forming a land bridge in Southwest Asia. Egypt is thus a transcontinental country, and a major power in Africa, the Mediterranean Basin, the Middle East and the Muslim world...

 in February 1916 as part of the reorganisation and expansion of the Australian Imperial Force
First Australian Imperial Force
The First Australian Imperial Force was the main expeditionary force of the Australian Army during World War I. It was formed from 15 August 1914, following Britain's declaration of war on Germany. Generally known at the time as the AIF, it is today referred to as the 1st AIF to distinguish from...

 and the New Zealand Expeditionary Force (NZEF) following the evacuation of Gallipoli in December 1915. Along with the II ANZAC Corps, it replaced the original Australian and New Zealand Army Corps (ANZAC). The corps initially participated in the defence of the Suez Canal
Suez Canal
The Suez Canal , also known by the nickname "The Highway to India", is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea and the Red Sea. Opened in November 1869 after 10 years of construction work, it allows water transportation between Europe and Asia without navigation...

 before being transferred to the Western Front
Western Front (World War I)
Following the outbreak of World War I in 1914, the German Army opened the Western Front by first invading Luxembourg and Belgium, then gaining military control of important industrial regions in France. The tide of the advance was dramatically turned with the Battle of the Marne...

 in France
France
The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

 and Belgium
Belgium
Belgium , officially the Kingdom of Belgium, is a federal state in Western Europe. It is a founding member of the European Union and hosts the EU's headquarters, and those of several other major international organisations such as NATO.Belgium is also a member of, or affiliated to, many...

 in late March 1916. Later in 1916 the New Zealand Division
New Zealand Division
The New Zealand Division was a World War I infantry division formed in Egypt in January 1916 following the evacuation of Gallipoli. At the outbreak of war the New Zealand Expeditionary Force contained a single infantry brigade which was combined with the unattached Australian 4th Infantry Brigade...

 was removed from I ANZAC's order of battle, swapping with II ANZAC's Australian 4th Division.

In November 1917, I ANZAC ceased to exist when the Australian infantry divisions in France were grouped together as the Australian Corps
Australian Corps
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...

 and the New Zealand Division
New Zealand Division
The New Zealand Division was a World War I infantry division formed in Egypt in January 1916 following the evacuation of Gallipoli. At the outbreak of war the New Zealand Expeditionary Force contained a single infantry brigade which was combined with the unattached Australian 4th Infantry Brigade...

, then part of II ANZAC Corps, was allocated to a British corps.

Formation

Following the evacuation of Gallipoli in December 1915, the Australian and New Zealand forces in Egypt underwent a period of reorganisation and expansion. It was decided to expand the AIF from two infantry divisions to four (later five), while the New Zealand elements of the New Zealand and Australian Division
New Zealand and Australian Division
The New Zealand and Australian Division was formed at the start of the Battle of Gallipoli as a composite division under the command of New Zealand general Alexander Godley. At the start of World War I New Zealand had mustered insufficient infantry battalions to form their own division while...

 would be split and expanded to form a full division known as the New Zealand Division
New Zealand Division
The New Zealand Division was a World War I infantry division formed in Egypt in January 1916 following the evacuation of Gallipoli. At the outbreak of war the New Zealand Expeditionary Force contained a single infantry brigade which was combined with the unattached Australian 4th Infantry Brigade...

. The five Australian and one New Zealand infantry divisions were then organised into two corps sized units, known as I ANZAC Corps and II ANZAC Corps
II Anzac Corps
The II ANZAC Corps was an Australian and New Zealand First World War army corps formed in Egypt in February 1916 as part of the reorganization of the Australian Imperial Force following the evacuation of Gallipoli in November 1915, under the command of William Birdwood...

.

I ANZAC Corps was initially commanded by General Alexander Godley
Alexander Godley
General Sir Alexander John Godley GCB, KCMG was a First World War general, best known for his role as commander of the New Zealand Expeditionary Force...

 and comprised the three "veteran" ANZAC divisions—the Australian 1st and 2nd Divisions and the newly formed New Zealand Division
New Zealand Division
The New Zealand Division was a World War I infantry division formed in Egypt in January 1916 following the evacuation of Gallipoli. At the outbreak of war the New Zealand Expeditionary Force contained a single infantry brigade which was combined with the unattached Australian 4th Infantry Brigade...

. The corps' divisions were initially manning the defences east of the Suez Canal
Suez Canal
The Suez Canal , also known by the nickname "The Highway to India", is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea and the Red Sea. Opened in November 1869 after 10 years of construction work, it allows water transportation between Europe and Asia without navigation...

 against the anticipated Turkish
Turkey
Turkey , known officially as the Republic of Turkey , is a Eurasian country located in Western Asia and in East Thrace in Southeastern Europe...

 invasion of Egypt
First Suez Offensive
The First Suez Offensive took place between the Ottoman Empire and the British Empire in the Sinai and Palestine Campaign of World War I...

. The large scale losses suffered by the French at Verdun
Battle of Verdun
The Battle of Verdun was one of the major battles during the First World War on the Western Front. It was fought between the German and French armies, from 21 February – 18 December 1916, on hilly terrain north of the city of Verdun-sur-Meuse in north-eastern France...

, however, highlighted the need for more Allied
Allies of World War I
The Entente Powers were the countries at war with the Central Powers during World War I. The members of the Triple Entente were the United Kingdom, France, and the Russian Empire; Italy entered the war on their side in 1915...

 troops in France and shortly after the battle it was decided to transfer the Australian and New Zealand infantry divisions to France. On 13 March 1916, under the command of General Sir William Birdwood—the original commander of the ANZAC—the corps began the process of embarking for France
France
The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

.

Western Front

In France the I ANZAC Corps was attached to the British Second Army
British Second Army
The British Second Army was active during both the First and Second World Wars. During the First World War the army was active on the Western Front and in Italy...

, and initially positioned in a relatively quiet sector south of Ypres
Ypres
Ypres is a Belgian municipality located in the Flemish province of West Flanders. The municipality comprises the city of Ypres and the villages of Boezinge, Brielen, Dikkebus, Elverdinge, Hollebeke, Sint-Jan, Vlamertinge, Voormezele, Zillebeke, and Zuidschote...

 in order to gain experience of trench warfare. The corps went into the line south of Armentières
Armentières
Armentières is a commune in the Nord department in the Nord-Pas-de-Calais region in northern France. It is part of the Urban Community of Lille Métropole, and lies on the Belgian border, northwest of the city of Lille, on the right bank of the river Lys....

, taking over from the British III Corps which was moving to the British Fourth Army
British Fourth Army
The Fourth Army was a field army that formed part of the British Expeditionary Force during the First World War. The Fourth Army was formed on 5 February 1916 under the command of General Sir Henry Rawlinson to carry out the main British contribution to the Battle of the Somme.-History:The Fourth...

 in preparation for the Somme Offensive
Battle of the Somme (1916)
The Battle of the Somme , also known as the Somme Offensive, took place during the First World War between 1 July and 14 November 1916 in the Somme department of France, on both banks of the river of the same name...

. The Australian 2nd Division was the first to move on to the line, taking up its position in the trenches on 9 April 1916.

On 5 May I ANZAC experienced its first combat on the Western Front when the Germans launched a raid on the 20th Battalion's positions following an artillery barrage, resulting in 100 casualties, and some men and equipment being captured. On 30 May, the 11th Battalion's position was also heavily shelled. Throughout June, I ANZAC carried out a number of trench raids
Trench raiding
Trench raiding was a feature of trench warfare which developed during World War I. It was the practice of making small scale surprise attacks on enemy position. Raids were made by both sides in the conflict and always took place at night for reasons of stealth...

 on the German positions in their sector. In the period between 20–30 June the corps carried out 10 such raids, and suffered 773 casualties.

In mid-July 1916, with the Somme Offensive faltering, the British commander-in-chief, General Douglas Haig
Douglas Haig
Douglas Haig, 1st Earl Haig was a British soldier and senior commander during World War I.Douglas Haig may also refer to:* Club Atlético Douglas Haig, a football club from Argentina* Douglas Haig , American actor...

, required fresh divisions to continue the advance. The corps was moved to General Hubert Gough
Hubert Gough
General Sir Hubert de la Poer Gough GCB, GCMG, KCVO was a senior officer in the British Army, who commanded the British Fifth Army from 1916 to 1918 during the First World War.-Family background:...

's Fifth Army
British Fifth Army
The Fifth Army was a field army of the British Army during World War I and part of the British Expeditionary Force during the First World War.-History:...

 and directed to capture Pozières
Battle of Pozières
The Battle of Pozières was a two week struggle for the French village of Pozières and the ridge on which it stands, during the middle stages of the 1916 Battle of the Somme. Though British divisions were involved in most phases of the fighting, Pozières is primarily remembered as an Australian battle...

. By this time the II ANZAC Corps
II Anzac Corps
The II ANZAC Corps was an Australian and New Zealand First World War army corps formed in Egypt in February 1916 as part of the reorganization of the Australian Imperial Force following the evacuation of Gallipoli in November 1915, under the command of William Birdwood...

 had started to arrive in France from Egypt under the command of General Godley. As Godley was also the commander of the New Zealand Expeditionary Force
New Zealand Expeditionary Force
The New Zealand Expeditionary Force was the title of the military forces sent from New Zealand to fight for Britain during World War I and World War II. Ultimately, the NZEF of World War I was known as the First New Zealand Expeditionary Force...

, it was decided that the New Zealand Division would be more appropriately located under his command so it swapped with the Australian 4th Division
Australian 4th Division (World War I)
The Australian 4th Division was formed in the First World War during the expansion of the Australian Imperial Force infantry brigades in February 1916. In addition to the experienced 4th Brigade were added the new 12th and 13th Brigades...

 in time for the move to the Somme.

Pozières had been attacked unsuccessfully four times prior, however on 23 July 1916 the 1st Division managed to capture the village after making an advance of 1,000 yards. Following this success the Germans began a heavy artillery bombardment of the Australian positions and having suffered 5,286 casualties, the 1st Division was relieved by the 2nd Division two days later. As the area surrounding the village was still in German hands, plans were made for further attacks. 1st Division's assault had been successful largely because of good staff work and preparation, however, the divisional commander, Major General Harold Walker
Harold Walker
Harold Walker, Baron Walker of Doncaster, PC, DL was an English Labour politician.Born in Audenshaw, Walker was educated at Manchester College of Technology and became a toolmaker...

, had also refused to be pressured by Gough into attacking before he was ready. The 2nd Division's commander, Major General James Gordon Legge
James Gordon Legge
Lieutenant General James Gordon Legge CB, CMG was an Australian Army Lieutenant General who served in World War I. His son Stanley Ferguson Legge reached the rank of Major General.-Early life and career:...

, however, did not and in the end he ordered an attack on 29 July without having carried out adequate planning. As a result the attack failed with a loss of 3,500 casualties and 2nd Division were forced to try again on 4–5 August. This subsequent attack proved more successful, however, over the course of the two attacks the division suffered 6,800 casualties.

Following the fighting around Pozières, all three divisions of I ANZAC took part in the Battle of Mouquet Farm
Battle of Mouquet Farm
The Battle of Mouquet Farm, which began on 5 August 1916, was part of the Battle of the Somme and followed the Battle of Pozières. The farm was eventually captured on 26 September by No. 16 Section of the 6th East Yorkshire Pioneers.-Battle:...

, which took place between 10 August and 3 September 1916. Due to the formation of a salient
Salients, re-entrants and pockets
A salient is a battlefield feature that projects into enemy territory. The salient is surrounded by the enemy on three sides, making the troops occupying the salient vulnerable. The enemy's line facing a salient is referred to as a re-entrant...

 in the Allied lines, the area surrounding the farm, across which the Australians had to advance, was under the observation of German artillery spotters and as a result of heavy barrages I ANZAC suffered heavily during the battle, with 6,300 casualties, 4,649 of which were suffered by the 4th Division alone. As a result of these losses, the corps was withdrawn to a quiet sector during September and October 1916, before returning to the Somme in November. A bitter winter set in shortly after, however, effectively ending major operations on the Western Front for 1916.

Throughout the end of 1916 and the beginning of 1917, I ANZAC was confined to defensive duties, however, in the spring they began a series of patrols along the front, during which it was discovered that the Germans were withdrawing to the Hindenburg Line
Hindenburg Line
The Hindenburg Line was a vast system of defences in northeastern France during World War I. It was constructed by the Germans during the winter of 1916–17. The line stretched from Lens to beyond Verdun...

. On 17 March, the 2nd Division was involved in the advance towards Bapaume
Bapaume
Bapaume is a commune and the seat of a canton in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France.-Geography:A farming and light industrial town located 10 miles south of Arras at the junction of the A1 autoroute and the N17 and N30 national roads its location is...

. Following this, elements of the corps took part in the fighting around Bullecourt
Battle of Arras (1917)
The Battle of Arras was a British offensive during the First World War. From 9 April to 16 May 1917, British, Canadian, New Zealand, Newfoundland, and Australian troops attacked German trenches near the French city of Arras on the Western Front....

 during April and May and Messines
Battle of Messines
The Battle of Messines was a battle of the Western front of the First World War. It began on 7 June 1917 when the British Second Army under the command of General Herbert Plumer launched an offensive near the village of Mesen in West Flanders, Belgium...

 in June in support of II ANZACThe 4th Division was detached from I ANZAC for this battle. before the corps as a whole was committed to the fighting around Ypres as part of the Fifth Army in September 1917.

On 16 September 1917, six weeks after the fighting at Ypres had begun, the 1st and 2nd Divisions took up position at Glencorse Wood under the cover of darkness. Four days later the Australian divisions were part of a renewed Allied offensive. Advancing side-by-side, they formed the centre of the attack in what has since become known as the Battle of Menin Road. The battle proved a success, albeit a costly one as the Australians suffered approximately 5,000 casualties. On 26 September the 4th and 5th Divisions, which had been attached to I ANZAC for the fighting around Polygon Wood
Battle of Polygon Wood
The Battle of Polygon Wood took place during the second phase of the Battle of Passchendaele in World War I. The battle was fought near Ypres, Belgium, in an area named the Polygon Wood after the layout of the area...

 carried out a successful attack in which they managed to capture both Polygon Wood and parts of Zonnebeke.

Later, on 4 October both I ANZAC and II ANZAC were involved in an attack on the Broodseinde ridge
Battle of Broodseinde
The Battle of Broodseinde was the most successful attack of the Battle of Passchendaele. Using the "bite and hold" tactic , the Allied forces conducted an attack on well-entrenched German forces and showed that it was possible for the allies to overcome even the stoutest German...

, with the four ANZAC divisions—1st, 2nd in I ANZAC and 3rd and New Zealand in II ANZAC—serving in the line alongside each other for the first time. After suffering from a heavy German artillery attack, I ANZAC launched an attack to capture pillboxes that dominated the ridge. As the Australian divisions left their trenches they were confronted by a force of Germans in no man's land who were carrying out an attack of their own. The two sides clashed with each other on open ground before the Germans were forced to retreat to the ridgeline. Further fighting ensued and afterwards I ANZAC managed to capture most of the German pillboxes on the crest of the ridgeline, but were stopped short of their secondary objective by defensive fire from German positions nearby. In all I ANZAC suffered approximately 4,500 casualties.

As a result of these successes the Allied high command felt that a breakthrough might finally be possible. Heavy rain, however, turned the ground to mud and further offensive actions resulted in heavy casualties for limited gains. By early November I ANZAC Corps was withdrawn from the line around Ypres.

Disbandment

In November 1917, the five Australian infantry divisions in France were grouped together as part of the Australian Corps
Australian Corps
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...

 and I and II ANZAC Corps ceased to exist.

Order of battle

While the composition of I ANZAC Corps changed a number of timesAt various times over the course of 1916 I ANZAC consisted of between one and four divisions, being various combinations of the 1st, 2nd, 4th, 5th and NZ Divisions attached at various times. with divisions being attached and detached as required for involvement in a particular campaign, the following order of battle is included for illustrative purposes. It is correct per the corps' arrival in France in 1916. Also at divisional level there were various support units including artillery field batteries and trench mortars, pioneer battalions and engineer field companies, machine gun companies and field ambulances.

Sources:

Corps Commander: Lieutenant-General Sir William Birdwood
1st Australian Division
1st Division (Australia)
The 1st Division is the main formation of the Australian Army and contains the majority of the army's regular forces. Its headquarters is in Enoggera, a suburb of Brisbane...

 
 
Major General Harold Walker
Harold Walker
Harold Walker, Baron Walker of Doncaster, PC, DL was an English Labour politician.Born in Audenshaw, Walker was educated at Manchester College of Technology and became a toolmaker...

1st Brigade 2nd Brigade
2nd Brigade (Australia)
The 2nd Brigade was a brigade-sized infantry unit of the Australian Army.Formed in 1903 as militia formation based in Victoria, the brigade later served during the First World War as part of the Australian Imperial Force, allocated to the 1st Division...

3rd Brigade
1st Battalion 5th Battalion 9th Battalion
2nd Battalion 6th Battalion 10th Battalion
3rd Battalion 7th Battalion 11th Battalion
4th Battalion 8th Battalion 12th Battalion
Pioneers 1st Australian Pioneer Battalion
2nd Australian Division    Major General James Gordon Legge
James Gordon Legge
Lieutenant General James Gordon Legge CB, CMG was an Australian Army Lieutenant General who served in World War I. His son Stanley Ferguson Legge reached the rank of Major General.-Early life and career:...

5th Brigade
5th Brigade (Australia)
5th Brigade is a brigade of the Australian Army. It is a Reserve combined arms formation based in New South Wales and forms part of the 2nd Division.-History:...

6th Brigade
6th Brigade (Australia)
The 6th Brigade is an Australian Army brigade. First formed during the First World War as an infantry unit of the Australian Imperial Force, the brigade served at Gallipoli and in France and Belgium on the Western Front...

7th Brigade
17th Battalion 21st Battalion
21st Battalion (Australia)
The 21st Battalion was an infantry battalion of the Australian Army. It was raised in 1915 as part of the First Australian Imperial Force for service during World War I and formed part of the 6th Brigade, attached to the 2nd Division. It fought during the Gallipoli campaign and on the Western Front...

25th Battalion
18th Battalion
18th Battalion (Australia)
The 18th Battalion was an infantry battalion of the Australian Army. During World War I, the battalion was raised in 1915 as part of the Australian Imperial Force, attached to the 5th Brigade, of the 2nd Division...

22nd Battalion 26th Battalion
19th Battalion 23rd Battalion
23rd Battalion (Australia)
The 23rd Battalion was an infantry battalion of the Australian Army. It was raised in 1915 as part of the Australian Imperial Force for service during World War I and formed part of the 6th Brigade, attached to the 2nd Division. It fought during the Gallipoli campaign and on the Western Front...

27th Battalion
27th Battalion (Australia)
The 27th Battalion was an infantry battalion of the Australian Army. It was initially raised in 1915 as part of the First Australian Imperial Force for service during World War I. During the conflict, the battalion saw action briefly at Gallipoli before later fighting on the Western Front between...

20th Battalion 24th Battalion
24th Battalion (Australia)
The 24th Battalion was an infantry battalion of the Australian Army. Originally raised in 1915 for service during World War I as part of the 1st Australian Imperial Force, it was attached to the 6th Brigade, 2nd Division and served during the Gallipoli campaign and in the trenches of the Western...

28th Battalion
Pioneers 2nd Australian Pioneer Battalion
New Zealand Division
New Zealand Division
The New Zealand Division was a World War I infantry division formed in Egypt in January 1916 following the evacuation of Gallipoli. At the outbreak of war the New Zealand Expeditionary Force contained a single infantry brigade which was combined with the unattached Australian 4th Infantry Brigade...

 
 
Major-General Andrew Hamilton Russell
Andrew Hamilton Russell
Major General Sir Andrew Hamilton Russell KCB, KCMG was a World War I general from New Zealand, who rose swiftly to high command during the Gallipoli campaign in 1915–1916 and to prominence as the inspirational commander of the New Zealand Division on the Western Front in 1917 and 1918.-Early life...

1st New Zealand Brigade 2nd New Zealand Brigade 3rd New Zealand Rifle Brigade
1st Auckland Battalion 2nd Auckland Battalion 1st Battalion, NZ Rifle Brigade
1st Canterbury Battalion 2nd Canterbury Battalion 2nd Battalion, NZ Rifle Brigade
1st Otago Battalion 2nd Otago Battalion 3rd Battalion, NZ Rifle Brigade
1st Wellington Battalion 2nd Wellington Battalion 4th Battalion, NZ Rifle Brigade
Pioneers New Zealand Pioneer Battalion
New Zealand (Māori) Pioneer Battalion
The New Zealand Pioneer Battalion or Native Contingent and Pioneer Battalion was a battalion of the New Zealand Expeditionary Force that served during World War I. The battalion was first raised in 1915 and served at Gallipoli and the Western Front and largely served as pioneers...

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