| Third Army | |
|---|---|
 3rd Army formation badge. | |
| Active | 1915–1919 |
| Country |  United Kingdom |
| Branch |  British Army |
| Type | Field army |
| Engagements | Battle of the Somme Battle of Arras Battle of Cambrai Battle of Passchendaele Battle of Amiens Hundred Days Offensive |
| Commanders | |
| Notable commanders | Edmund Allenby Sir Julian Byng |
The Third Army was a field army of the British Army during World War I that saw active service on the Western Front throughout the war.
The Third Army was part of the British Army during World War I and was formed in France on 13 July 1915, under the command of Lieutenant-General Charles Monro. [1] During August 1915 the Third Army took over trench line south of the French Tenth Army, which had to keep in position for the forthcoming autumn offensive. This made the Third Army geographically separate from the other British armies for the time being. [2] This remained the case until March 1916, when the Tenth Army was moved to take part in the Battle of Verdun because of French losses and the Fourth Army was formed in preparation for the Battle of the Somme. [3]
The battles it took part in on the Western Front included:
Third Army Order of Battle, August 1918. [5]
The army was not reraised during the Second World War. However, due to various Allied deception efforts, German intelligence over-estimated the number of Allied forces based within the UK by the start of 1944. While there was no specific deception effort to create the Third Army, German intelligence believed that one had been formed from Northern Command. [6]
The Western Front was one of the main theatres of war during the First World War. Following the outbreak of war in August 1914, the German Army opened the Western Front by invading Luxembourg and Belgium, then gaining military control of important industrial regions in France. The German advance was halted with the Battle of the Marne. Following the Race to the Sea, both sides dug in along a meandering line of fortified trenches, stretching from the North Sea to the Swiss frontier with France, the position of which changed little except during early 1917 and again in 1918.
The Battle of the Somme, also known as the Somme offensive, was a major battle of the First World War fought by the armies of the British Empire and the French Third Republic against the German Empire. It took place between 1 July and 18 November 1916 on both sides of the upper reaches of the river Somme in France. The battle was intended to hasten a victory for the Allies. More than three million men fought in the battle, of whom more than one million were either wounded or killed, making it one of the deadliest battles in all of human history.
The British Expeditionary Force (BEF) was the six divisions the British Army sent to the Western Front during the First World War. Planning for a British Expeditionary Force began with the 1906–1912 Haldane Reforms of the British Army carried out by the Secretary of State for War Richard Haldane following the Second Boer War (1899–1902).
The Canadian Corps was a World War I corps formed from the Canadian Expeditionary Force in September 1915 after the arrival of the 2nd Canadian Division in France. The corps was expanded by the addition of the 3rd Canadian Division in December 1915 and the 4th Canadian Division in August 1916. The organization of a 5th Canadian Division began in February 1917 but it was still not fully formed when it was broken up in February 1918 and its men used to reinforce the other four divisions.
IV Corps was a corps-sized formation of the British Army, formed in both the First World War and the Second World War. During the First World War the corps served on the Western Front throughout its existence. During the Second World War it served in Norway and Britain until it was transferred to India, which was threatened with attack after Japan entered the war.
The Fifth Army was a field army of the British Army during World War I that formed part of the British Expeditionary Force on the Western Front between 1916 and 1918. The army originated as the Reserve Corps during the preparations for the British part of the Somme Offensive of 1916, was renamed Reserve Army when it was expanded and became the Fifth Army in October 1916.
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.
The 32nd Division was an infantry division of the British Army that was raised in 1914, during the First World War. The division was raised from volunteers for Lord Kitchener's New Armies, made up of infantry 'Pals battalions' and artillery brigades raised by public subscription or private patronage. The division was taken over by the War Office in September 1915. It served in France and Belgium in the trenches of the Western Front for the duration of the war. It saw action at the Battle of the Somme, the Pursuit to the Hindenburg Line, the Defence of Nieuport, the German spring offensive, and the Allied Hundred Days Offensive beginning at the Battle of Amiens. After the Armistice it marched into Germany as part of the Army of Occupation.
VII Corps was an army corps of the British Army active in the First and Second World Wars. In the early part of the Second World War it was part of the defence forces of the United Kingdom, and later acted as a shadow formation for deception purposes.
General Henry Sinclair Horne, 1st Baron Horne, was a military officer in the British Army, most notable for his generalship during the First World War, where he commanded at division, corps, and field army level, rising to command the British First Army in 1916, which he held until the armistice of 11 November 1918. He was the only British artillery officer to command an army in the war.
The Second Battle of the Somme of 1918 was fought during the First World War on the Western Front from late August to early September, in the basin of the River Somme. It was part of a series of successful counter-offensives in response to the German Spring Offensive, after a pause for redeployment and supply.
X Corps was a corps of the British Army that served in the First World War on the Western Front before being disbanded in 1919. The corps was re-formed in 1942 during the Second World War and saw service in the North African Campaign and the Italian Campaign where it came under command of the US Fifth Army and the British Eighth Army.
The Tenth Army was a Field army of the French Army during World War I and World War II.
V Corps was an army corps of the British Army that saw service in both the First and the Second World Wars. It was first organised in February 1915 and fought through the First World War on the Western front. It was recreated in June 1940, during the Second World War and was substantially reorganised in 1942 for participation in Operation Torch. It fought through the Tunisia Campaign and later the Italian Campaign.
The Allied leaders of World War I were the political and military figures that fought for or supported the Allied Powers during World War I.
The 57th Division was an infantry formation of the Territorial Force created in 1914 as part of the massive expansion of the British Army during the First World War. It served on the Western Front during 1917 and 1918. The divisional number was reactivated for deception purposes during the Second World War.
XI Corps was a corps-sized formation of the British Expeditionary Force, active during the First World War that served on the Western Front and in Italy. It was recreated as part of Home Forces defending the United Kingdom during the Second World War.
VI Corps was an army corps of the British Army in the First World War. It was first organised in June 1915 and fought throughout on the Western Front. It was briefly reformed during the Second World War to command forces based in Northern Ireland, but was reorganized as British Forces in Ireland one month later.
The 58th Division was an infantry division created in 1915 as part of the massive expansion of the British Army during the First World War. It was a 2nd Line Territorial Force formation raised as a duplicate of the 56th Division. After training in Britain, the division joined the British Expeditionary Force (BEF) on the Western Front in 1917. It saw action at the battles of Arras and Passchedaele in 1917 and the German spring offensive in 1918. It then took part in the Battle of Amiens and the final Allied Hundred Days Offensive of the war. The division was recreated during the Second World War, as an imaginary deception formation.
The 126th Brigade was an infantry brigade of the British Army during the First World War and the Second World War. It was assigned to the 42nd Division and served in the Middle East and on the Western Front in the Great War. In the Second World War, now as the 126th Infantry Brigade, it served again with the 42nd Division in France and was evacuated at Dunkirk and then later converted into 11th Armoured Brigade.
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