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.
The 9th (Scottish) Division, was an infantry division of the British Army during the First World War, one of the Kitchener's Army divisions raised from volunteers by Lord Kitchener to serve on the Western Front during the First World War.
The 14th (Light) Division was an infantry division of the British Army, one of the Kitchener's Army divisions raised from volunteers by Lord Kitchener during the First World War. All of its infantry regiments were originally of the fast marching rifle or light infantry regiments, hence the title "Light". It fought on the Western Front for the duration of the First World War.
The division was disbanded by March 1919, and was not reformed in the Second World War.
The 4th Infantry Division was a regular infantry division of the British Army with a very long history, seeing active service in the Peninsular War and Waterloo Campaign, the Crimean and Boer Wars and both World Wars. It was disbanded after the Second World War and reformed in the 1950s as an armoured formation before being disbanded and reformed again and finally disbanded on 1 January 2012.
The 5th Infantry Division was a regular army infantry division of the British Army. It was established by Arthur Wellesley, 1st Duke of Wellington for service in the Peninsular War, as part of the Anglo-Portuguese Army, and was active for most of the period since, including the First World War and the Second World War and was disbanded soon after. The division was reformed in 1995 as an administrative division covering Wales and the English regions of West Midlands, East Midlands and East. Its headquarters were in Shrewsbury. It was disbanded on 1 April 2012.
The 8th Infantry Division was an infantry division of the British Army that was active in both the First and Second World Wars. The division was first formed in October 1914 during the First World War, initially consisting mainly of soldiers of the Regular Army and served on the Western Front throughout the war, sustaining many casualties, before disbandment in 1919. The division was reactivated in Palestine, under the command of Major-General Bernard Montgomery, in the late 1930s in the years running up to the Second World War before being disbanded in late February 1940. It was briefly reformed in Syria in an administrative role during 1942-3.
The 4th Canadian Division is a formation of the Canadian Army. The division was first created as a formation of the Canadian Corps during the First World War. During the Second World War the division was reactivated as the 4th Canadian Infantry Division in 1941 and then converted to armour and redesignated as the 4th Canadian (Armoured) Division. Beginning in 1916 the division adopted a distinctive green-coloured formation patch as its insignia. In 2013 it was announced that Land Force Central Area would be redesignated 4th Canadian Division. It is currently responsible for Canadian Army operations in the Canadian province of Ontario and is headquartered at Denison Armoury in Toronto.
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.
The 16th Infantry Brigade was an infantry brigade of the British Army that saw active service during the Second Boer War and the First and Second World Wars.
The 24th Infantry Brigade was an infantry brigade of the British Army from the First World War. It was reraised during the Second World War, as the 24th Infantry Brigade (Guards). During various designations, the brigade was active throughout the Cold War and existed until 1999, when it was merged with the 5 Airborne Brigade to become 16 Air Assault Brigade.
The 2nd Infantry Brigade was a regional brigade of the British Army, active since before the First World War. It was the regional formation of the Army in the South East of England–the Brigade commanded and administered soldiers throughout Kent, Surrey and Sussex–but also Brunei. In December 2014 the Brigade merged with 145 (South) Brigade to form Headquarters 11th Infantry Brigade and Headquarters South East.
The 11th Security Force Assistance Brigade is a brigade of the British Army which is intended to train and assist foreign forces. In 2021, under the Future Army changes, the brigade was redesignated, formerly being the 11th Infantry Brigade & HQ South East. Prior to the Army 2020 changes in 2013, the brigade was temporarily activated for deployment to Afghanistan. Originally formed in the Second Boer War, the brigade was and engaged during both World Wars.
The 12th Armoured Brigade Combat team, formerly the 12th Armoured Infantry Brigade, is a regular brigade of the British Army which has been in almost continuous existence since 1899 and now forms part of 3rd Division.
The 3rd Infantry Brigade was a Regular Army infantry brigade of the British Army, part of the 1st Infantry Division. Originally formed in 1809, during the Peninsular War, the brigade had a long history, seeing action in the Second Anglo-Afghan War, and during both the First and the Second World Wars.
The 5th Infantry Brigade was a regular infantry brigade of the British Army that was in existence since before the First World War, except for a short break in the late 1970s. It was an Airborne Brigade from the early 1980s until amalgamating with 24th Airmobile Brigade, in 1999, to form 16 Air Assault Brigade.
The 29th Infantry Brigade was an infantry brigade unit of the British Army. It was originally raised in 1914 and saw service during the First and Second World Wars and the Korean War.
The 8th Infantry Brigade was an infantry brigade of the British Army that saw active service in both the First and the Second World Wars, before being disbanded and reactivated in the 1960s. The brigade was finally being disbanded in 2006. It was formed before the First World War as part of the 3rd Division. As part of that division it spent the entire war on the Western Front from 1914 to 1918 in the First World War. The brigade was also active during the Second World War.
The 6th Infantry Brigade was a regular infantry brigade of the British Army that was in existence during the Second Boer War, the First World War and the Second World War and later formed part of British Army of the Rhine.
The Loyal Regiment (North Lancashire) (until 1921 known as the Loyal North Lancashire Regiment) was a line infantry regiment of the British Army that was in existence from 1881 to 1970. In 1970, the regiment was amalgamated with the Lancashire Regiment to form the Queen's Lancashire Regiment which was, in 2006, amalgamated with the King's Own Royal Border Regiment and the King's Regiment (Liverpool and Manchester) to form the Duke of Lancaster Regiment (King's, Lancashire and Border).
The 9th Infantry Brigade was a Regular Army infantry brigade of the British Army that saw active service during both the First and Second World Wars.
United Kingdom 
British Army