The Third Army was a

field army A field army (also known as numbered army or simply army) is a military formation in many armed forces, composed of two or more corps. It may be subordinate to an army group. Air army, Air armies are the equivalent formations in air forces, and ...

of the

British Army during World War I The British Army during the First World War fought the largest and most costly war in its History of the British Army, long history. Unlike the French Army in World War I, French and German Army (German Empire), German Armies, the British Ar ...

that saw active service on the Western Front throughout the war.

First World War

The Third Army was part of the

. It was formed in France on 13 July 1915, under the command of

Lieutenant-General Lieutenant general (Lt Gen, LTG and similar) is a military rank used in many countries. The rank traces its origins to the Middle Ages, where the title of lieutenant general was held by the second-in-command on the battlefield, who was normall ...

Charles Monro. During August 1915 the Third Army took over a 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. This remained the case until March 1916, when the Tenth Army was moved to take part in the

Battle of Verdun The Battle of Verdun ( ; ) was fought from 21 February to 18 December 1916 on the Western Front (World War I), Western Front in French Third Republic, France. The battle was the longest of the First World War and took place on the hills north ...

because of French losses and the Fourth Army was formed in preparation for the

Battle of the Somme The Battle of the Somme (; ), also known as the Somme offensive, was a 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 Nove ...

. The battles it took part in on the Western Front included: *

* Battle of Cambrai * Second Battle of Arras (April 1917) *

Battle of Passchendaele The Third Battle of Ypres (; ; ), also known as the Battle of Passchendaele ( ), was a campaign of the First World War, fought by the Allies of World War I, Allies against the German Empire. The battle took place on the Western Front (World Wa ...

Burton, Pierre, ''Marching as to war'', 2001, Toronto * Battle of Amiens (August 1918) *

Hundred Days Offensive The Hundred Days Offensive (8 August to 11 November 1918) was a series of massive Allied offensives that ended the First World War. Beginning with the Battle of Amiens (8–12 August) on the Western Front, the Allies pushed the Imperial Germa ...

Order of battle

Third Army Order of Battle, August 1918. * IV Corps ** 37th Division ** 42nd (East Lancashire) Division **

62nd (2nd West Riding) Division The 62nd (2nd West Riding) Division was an infantry division of the British Army that saw active service on the Western Front during the First World War. History During the First World War the division fought on the Western Front at Bulle ...

New Zealand Division The New Zealand Division was an infantry division of the New Zealand Expeditionary Force raised for service in the First World War. It was formed in Egypt in early 1916 when the New Zealand and Australian Division was renamed after the detachmen ...

** 5th Division * V Corps ** 21st Division **

38th (Welsh) Division The 38th (Welsh) Division (initially the 43rd Division, later the 38th (Welsh) Infantry Division and then the 38th Infantry (Reserve) Division) of the British Army was active during both the First and Second World Wars. In 1914, the division ...

17th (Northern) Division The 17th (Northern) Division was an infantry division of the British Army, a Kitchener's Army formation raised during the Great War. Formation history The 17th (Northern) Division was created under Northern Command in September 1914, just a ...

** 33rd Division * VI Corps **

Guards Division The Guards Division was an administrative unit of the British Army responsible for the training and administration of the regiments of Foot Guards and the London Guards reserve battalion. The Guards Division was responsible for providing tw ...

** 2nd Division ** 3rd Division ** 59th (2nd North Midland) Division * XVII Corps **

51st (Highland) Division The 51st (Highland) Division was an infantry Division (military), division of the British Army that fought on the Western Front (World War I), Western Front in France during the World War I, First World War from 1915 to 1918. The division was ra ...

** 52nd Division **

56th (London) Division The 56th (London) Infantry Division was a Territorial Army (United Kingdom), Territorial Army infantry Division (military), division of the British Army, which served under several different titles and designations. The division served in the Tre ...

57th (2nd West Lancashire) Division The 57th (2nd West Lancashire) 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 ...

63rd (Royal Naval) Division The 63rd (Royal Naval) Division was a United Kingdom infantry division of the First World War. It was originally formed as the Royal Naval Division at the outbreak of the war, from Royal Navy and Royal Marine reservists and volunteers, who we ...

Commanders

* General Charles Monro (July–September 1915) * General

Edmund Allenby Field marshal (United Kingdom), Field Marshal Edmund Henry Hynman Allenby, 1st Viscount Allenby, (23 April 1861 – 14 May 1936) was a senior British Army Officer (armed forces), officer and imperial governor. He fought in the Second Boer ...

(23 October 1915 – 9 June 1917) * General Sir Julian Byng (9 June 1917 – 22 March 1919)

Second World War

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.

References

Sources

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