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).
I Corps was an army corps in existence as an active formation in the British Army for most of the 80 years from its creation in the First World War until the end of the Cold War, longer than any other corps. It had a short-lived precursor during the Waterloo Campaign. It served as the operational component of the British Army of the Rhine during the Cold War, and was tasked with defending West Germany.
The British Second Army was a field army active during the First and Second World Wars. During the First World War the army was active on the Western Front throughout most of the war and later active in Italy. During the Second World War the army was the main British contribution to the Normandy landings on 6 June 1944 and advance across Europe.
VIII Corps was a British Army corps formation that existed during the First and Second World Wars. In the latter, it took part in the Normandy Campaign in 1944, where it was involved in Operation Epsom and Operation Goodwood. It would later play a supporting role in Operation Market Garden and finish the war by advancing from the Rhine to the Baltic Sea.
IX Corps was a corps-sized formation of the British Army that existed during the First and the Second World Wars.
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.
An army group is a military organization consisting of several field armies, which is self-sufficient for indefinite periods. It is usually responsible for a particular geographic area. An army group is the largest field organization handled by a single commander – usually a full general or field marshal – and it generally includes between 400,000 and 1,000,000 soldiers.
The II Corps was an army corps of the British Army formed in both the First World War and the Second World War. There had also been a short-lived II Corps during the Waterloo Campaign.
III Corps was an army corps of the British Army formed in both the First World War and the Second World War.
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.
General Sir Kenneth Arthur Noel Anderson, was a senior British Army officer who saw service in both world wars. He is mainly remembered as the commander of the British First Army during Operation Torch, the Allied invasion of North Africa and the subsequent Tunisian campaign which ended with the capture of almost 250,000 Axis soldiers. An outwardly reserved character, he did not court popularity either with his superiors or with the public.
Lieutenant General Sir Hugh Jamieson Elles was a British officer and the first commander of the newly formed Tank Corps during the First World War.
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.
General Sir William Platt was a senior officer of the British Army during both the First and the Second World Wars.
13th Corps was a corps-sized formation of the British Army that fought on the Western Front during the First World War and was reformed for service during the Second World War, serving in the Mediterranean and Middle East throughout its service.
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.
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.
Sir John Lindesay Keir was a British soldier and general of the late 19th and early 20th century. He fought in the Second Boer War, and commanded the 6th Division and the VI Corps of the British Army on the Western Front during World War I.
General Officers of World War I is an oil painting by John Singer Sargent, completed in 1922. It was commissioned by South African financier Sir Abraham Bailey, 1st Baronet to commemorate the generals who commanded British and British Empire armies in the First World War.
United Kingdom 
British Army 