British units in World War I
This page is about units mainly recruited in the United Kingdom from British subjects. For units recruited by the British Crown or colonial governments outside the UK, India and the major dominions, see British colonial units in World War I. For example, we class the Royal Newfoundland Regiment, West India Regiment and British West Indies Regiment as colonial, not British, as this seems to agree with the definition in the Manual of Military Law. If you're not sure where to look for a specific unit, use the website search. This can also help you find specific units under variant names.
See how you can help to find out how you can help collect experiences of those in the First World War in their own words.
Here's a list of REGIMENTS and CORPS of the BRITISH ARMY in 1918 (via the Internet Archive as the site appears to have been down for some years).
If you've got a diary, letters or other personal narratives you want to add now:
- if the page for the author's unit already exists, you can add it straight to the page. See below for which British units do and don't currently have pages.
- if the page for the author's unit doesn't yet exist, you can create it.
- if you don't want to create a page or you don't know which unit the author belonged to, you can add the narrative to Lists of personal diaries, letters, memoirs.
See also naming conventions for British units.
- 1 British Army
- 1.1 Higher formations
- 1.2 Infantry
- 1.3 Cavalry
- 1.4 Machine Gun Units
- 1.5 Artillery
- 1.6 Cyclists
- 1.7 Other regiments, corps and departments
- 2 Volunteer Training Corps and Volunteer Force
- 3 Royal Navy
- 4 Royal Marines
- 5 Royal Air Force
- 6 Other organisations
The British Army consisted of land forces raised in the United Kingdom apart from the Royal Marines and the Royal Naval Division. It had these branches:
- Regular Army
- New Army
- Territorial Force
- Special Reserve
- Volunteer Force
Most regiments and corps included a mixture of units from each branch.
Every British army unit that has a page on this site should be listed in Category:All British Army units.
See also British Army Hierarchies for more information about the structure of the Army.
These are tactical formations above division level:
- Category:British corps (tactical) has pages for every corps except and Tank Corps headquarters. These were the next level above divisions.
- Category:British armies has pages for all the armies on the Western Front and at Salonika and Gallipoli. These were the next level above corps.
- Category:British Empire GHQs contains expeditionary forces and other formations that had the general headquarters in a theatre of war. Some pages have been added but several theatres are still missing.
We now have a page for every infantry regiment of the British Army. The table below shows links to the pages and the regiments' full names. It can be sorted by names or order of precedence. The website search can also help you find specific units under variant names.
Also administratively part of the infantry:
Regiment pages show each regiment's parent record office. Record offices also have their own pages, listed in Category:British Army record offices.
'The battalion was the basic tactical unit of the infantry of the British Army in the Great War of 1914-1918. At full establishment it consisted of 1,007 men of whom 30 were officers. It comprised a Battalion Headquarters and four Companies.'
We now have pages for nearly every British infantry battalion known to have existed. There might be some provisional battalions and Royal Defence Corps battalions missing: these will need to be added manually if any can be identified.
We don't yet have any information about Royal Defence Corps protection companies.
See also #Volunteer Training Corps below.
There are too many battalions to list on this page (already more than 1,700), but there are several ways you can find them:
The regiment pages shown in the table above should list all battalions known to have been part of a regiment.
The following categories list British infantry battalions:
- Category:British infantry battalions: all British infantry battalions that have pages, listed alphabetically by regiment, then in order of battalion numbers. Includes Army, Royal Navy and Royal Marines.
- Also has sub-categories listing certain battalions by uniform distinctions and special roles, but these are not yet complete.
- Category:British Army infantry battalions by regimental precedence: British Army infantry battalions only, listed in order of regimental precedence as shown in the above table, then in order of battalion numbers.
You can also use the search box to find battalions that already have pages. You don't always have to enter the name exactly as it appears in the page title: alternative names will often show up as redirects or part of the page text.
We now have a page for nearly every British infantry brigade that has war diaries. These pages are listed in Category:British infantry brigades.
Please feel free to add any missing brigades.
We now have pages for every British infantry division, including the divisions of the original Fourth New Army that were broken up in April 1915. These pages are listed in Category:British divisions.
We now have pages for more or less every British cavalry and yeomanry unit. You can find them in Category:British mounted units and its sub-categories.
Cavalry administrative units
These are the administrative corps and record offices of the British cavalry, including regular, yeomanry and Special Reserve regiments:
- Household Cavalry, British Army
- Canterbury Cavalry Record Office, British Army
- York Cavalry Record Office, British Army
Cavalry divisions and corps
- Cavalry Corps, British Army
- 1st Cavalry Division, British Army
- 2nd Cavalry Division, British Army
- 3rd Cavalry Division, British Army
- the numbers 4th and 5th were used by Indian divisions
- 1st Mounted Division, British Army
- 2nd Mounted Division, British Army
- 3rd Mounted Division, British Army
- 4th Mounted Division, British Army
- Yeomanry Mounted Division, British Army
See Category:British cavalry and mounted brigades for regular cavalry and yeomanry mounted brigades.
Cavalry and yeomanry regiments
Cavalry and yeomanry (ie Territorial cavalry) regiments and independent squadrons are listed in these categories:
- Category:British cavalry units lists all cavalry regiments and squadrons that have pages alphabetically by regiment name, including regular cavalry, yeomanry, Special Reserve and corps cavalry regiments.
- Category:British cavalry by regimental precedence lists regular cavalry and yeomanry regiments by order of precedence.
- Category:British yeomanry by county lists yeomanry regiments alphabetically by county, which is not always the same as regiment name.
- Chris Baker, The Long, Long Trail: The British cavalry regiments of 1914-1918 lists British regular and special reserve cavalry regiments, with further reading.
- Chris Baker, The Long, Long Trail: The British Yeomanry of 1914-1918 lists British yeomanry regiments (these were the Territorial branch of the cavalry).
- Chris Baker, The Long, Long Trail: Renumbering of the Territorial Force Yeomanry in 1917 lists which administrative corps each regiment belonged to.
Imperial Camel Corps
Machine Gun Units
We now have pages for all British machine gun units that have war diaries. Any that don't have war diaries will need to be added manually.
Most units belonged to Machine Gun Corps, British Army, consisting of:
- Machine Gun Corps (Infantry), British Army:
- Machine Gun Corps (Cavalry), British Army
- machine gun squadrons attached to cavalry brigades: see Category:British machine gun squadrons
- Machine Gun Corps (Motors), British Army, formerly part of Royal Field Artillery, British Army and known as the Motor Machine Gun Service.
- Machine Gun Corps (Heavy), British Army operated the first tanks and became Tank Corps, British Army
- Machine Gun Training Centre, British Army
The Guards had their own machine gun units which were administratively separate from the Machine Gun Corps:
- machine gun companies:
- Guards Machine Gun Regiment, British Army (formerly Machine Gun Guards):
Royal Artillery, British Army was an arm of the British Army, divided into two corps:
- Royal Horse Artillery and Royal Field Artillery, British Army; divided into two distinct identities:
- Royal Garrison Artillery, British Army
The basic unit of the Royal Field Artillery was the brigade, which was roughly equivalent to an infantry battalion.
We now have pages for every Royal Horse Artillery unit that has war diaries. These are listed in Category:British horse artillery units.
Most of these were administratively under Army Cyclist Corps, British Army but there are some exceptions. The following independent units were also classed as infantry regiments:
- Highland Cyclist Battalion, British Army
- Huntingdonshire Cyclist Battalion, British Army
- Kent Cyclist Battalion, British Army
- Northern Cyclist Battalion, British Army
The Territorial battalions of some county infantry regiments were equipped as cyclists. All of these battalions have pages and are categorised as cyclist battalions as well as infantry battalions.
Some yeomanry cavalry regiments were converted into cyclists. We haven't yet catalogued these changes but all yeomanry regiments have pages.
Other regiments, corps and departments
This is a list of other regiments, corps and departments of the British Army.
- Army Chaplains Department, British Army
- Army Ordnance Corps, British Army
- Army Ordnance Department, British Army
- Army Pay Corps, British Army
- Army Pay Department, British Army
- Army Service Corps, British Army
- Army Veterinary Corps, British Army
- Labour Corps, British Army
- Military Police, British Army divided into:
- Non-Combatant Corps, British Army
- Royal Army Medical Corps, British Army
- Royal Army Ordnance Corps, British Army
- Royal Engineers, British Army
- Tank Corps, British Army
- Queen Alexandra's Imperial Military Nursing Service
- Territorial Force Nursing Service, British Army
- Queen Mary's Army Auxiliary Corps, British Army
Officer Cadet Battalions
These battalions were set up to train new officers. They all have pages, listed in Category:British officer cadet battalions.
Volunteer Training Corps and Volunteer Force
Home defence units similar to the Home Guard in WW2. Initially known as the Volunteer Training Corps and not officially part of the British Army, although regulated by the War Office. In June 1916, the British Crown declared that volunteer units could be accepted under the terms of the 1863 Volunteer Act, which had never been repealed but had not been used in practice since the old Volunteer Force was converted into the Territorial Force in 1908. From then on, volunteer units accepted by the Crown were part of the Volunteer Force and their names were listed in the official Army Orders when they were accepted. In 1918, Volunteer battalions were integrated into British Army regiments. We're not yet sure how far they were administratively integrated, but at the very least they took the name and badge of the parent regiment.
For the purposes of data on this site, "Volunteer Force" is treated as a branch of the British Army, covering units from the date they were accepted by the Crown. "Volunteer Training Corps" is treated as a separate service, covering the same units before they were accepted by the Crown, and units that were never accepted into the Volunteer Force, if any can be identified.
Infantry units accepted by the Crown in 1916 are listed in Army Orders 206, 284, 323 and 374 of 1916. A few more are shown in Army Order 110 of 1918. New names and affiliations given in 1918 are shown in Army Order 208 of 1918.
For more information see:
- Regular Navy
- Royal Naval Reserve
- Royal Naval Volunteer Reserve
Also included the Royal Naval Air Service, which operated aircraft and armoured cars.
These infantry units and formations were raised by the Royal Navy but fought on land under Army command.
- 63rd (Royal Naval) Division, British
- 1st Royal Naval Brigade, British
- 188th Infantry Brigade, British
- 189th Infantry Brigade, British
- Anson Battalion, British
- Benbow Battalion, British
- Collingwood Battalion, British
- Drake Battalion, British
- Hawke Battalion, British
- Hood Battalion, British
- Howe Battalion, British
- Nelson Battalion, British
- Royal Marine Light Infantry, British Army
- Royal Marine Artillery, British Army
- Royal Marine Engineers, British Army
RMLI units that were not part of the Royal Naval Division will need to be added manually if any can be identified.
Royal Air Force
Formed in April 1918 from the Royal Flying Corps (part of the Army) and Royal Naval Air Service (part of the Royal Navy).
We need more information about the legal and administrative status of some of these organisations in relation to the British Army.
- Voluntary Aid Detachments included men's and women's units. Officially recognised by the War Office, but what was its relationship with the Army?
- British Red Cross
- Order of St John
- Friends Ambulance Unit: set up by Quakers and operated with the British Red Cross and Order of St John. More information. Was this a recognised Voluntary Aid Detachment or something else?
See also women's departments of the British Army above.
- Women's Hospital Corps, British
- Scottish Women's Hospitals: not officially recognised by the British War Office but served with other allied nations in several theatres.
- The Women's Volunteer Reserve, British
- The Women's Legion, British
- Almeric Paget Military Massage Corps, British
- First Aid Nursing Yeomanry, British (FANY, now the Princess Royal’s Volunteer Corps). Authorised by the British Crown but separate from the Army.
- Women's Auxiliary Force, British
- Women's Auxiliary Agricultural Corps, British
- Women's Forage Corps, British
- Women's Forestry Corps, British
- Women's Land Army, British