Seventeen Cavalry Reserve Regiments were formed by the British Army

British Army

The British Army is the land warfare branch of Her Majesty's Armed Forces in the United Kingdom. It came into being with the unification of the Kingdom of England and Scotland into the Kingdom of Great Britain in 1707. The new British Army incorporated Regiments that had already existed in England...

 on the outbreak of the Great War in August, 1914. These were affiliated with one or more active cavalry regiments

Cavalry regiments of the British Army

There are currently nine regular cavalry regiments of the British Army, with two tank regiments provided by the Royal Tank Regiment, traditionally classed alongside the cavalry, for a total of eleven regiments. Of these, five serve as armoured regiments, and five as formation reconnaissance...

, their purpose being to train replacement drafts for the active regiments. In 1915, the 3rd (i.e. training) Regiments of the Yeomanry

Yeomanry

Yeomanry is a designation used by a number of units or sub-units of the British Territorial Army, descended from volunteer cavalry regiments. Today, Yeomanry units may serve in a variety of different military roles.-History:...

 were also affiliated with the Cavalry Reserve and, in September 1916, the Household Cavalry Reserve Regiment was formed in Windsor, supplying replacements to the dismounted Household Battalion

Household Battalion

The Household Battalion was an infantry battalion of the British army during the Great War. It was formed in September 1916 from the reserves of the Household Cavalry regiments to help fill the every-increasing demands for infantry on the Western Front...

. In 1917, the regiments underwent major reorganization, being reduced to ten in number.

Although nominally cavalry, many of the drafts ended up being converted into infantry in order to satisfy the manpower demands of trench warfare.

Despite being training and not combat formations, several were involved in the putting down of the Easter Rising

Easter Rising

The Easter Rising was an insurrection staged in Ireland during Easter Week, 1916. The Rising was mounted by Irish republicans with the aims of ending British rule in Ireland and establishing the Irish Republic at a time when the British Empire was heavily engaged in the First World War...

 in Dublin in April 1916. A little after noon on Easter Monday, a mixed troop of 9th and 12th Lancers, attached to the 6th Cavalry Reserve Regiment at Marlborough Barracks in Phoenix Park

Phoenix Park

Phoenix Park is an urban park in Dublin, Ireland, lying 2–4 km west of the city centre, north of the River Liffey. Its 16 km perimeter wall encloses , one of the largest walled city parks in Europe. It includes large areas of grassland and tree-lined avenues, and since the seventeenth...

, was dispatched to investigate a "disturbance" at Dublin Castle

Dublin Castle

Dublin Castle off Dame Street, Dublin, Ireland, was until 1922 the fortified seat of British rule in Ireland, and is now a major Irish government complex. Most of it dates from the 18th century, though a castle has stood on the site since the days of King John, the first Lord of Ireland...

. As they cantered down Sackville Street, they were fired upon by rebels who had taken up positions in and on the roof of the General Post Office

General Post Office (Dublin)

The General Post Office ' in Dublin is the headquarters of the Irish postal service, An Post, and Dublin's principal post office...

. Three troopers were killed instantly and one was mortally wounded, becoming the first military casualties of the rising. The same evening, 1600 men of the 3rd Reserve Cavalry Brigade (consisting of the 8th, 9th and 10th Cavalry Reserve Regiments) arrived from their barracks at the Curragh

Curragh Camp

The Curragh Camp is an army base and military college located in The Curragh, County Kildare, Ireland. It is the main training centre for the Irish Army.- Brief history of the Curragh's military heritage :...

 to support the local Dublin garrison.

Original August 1914 Formations

Regiment	Location	Affiliated Regiments	Remarks
1st Life Guards	Hyde Park Hyde Park, London Hyde Park is one of the largest parks in central London, United Kingdom, and one of the Royal Parks of London, famous for its Speakers' Corner.The park is divided in two by the Serpentine...	1st Life Guards
2nd Life Guards	Windsor Windsor, Berkshire Windsor is an affluent suburban town and unparished area in the Royal Borough of Windsor and Maidenhead in Berkshire, England. It is widely known as the site of Windsor Castle, one of the official residences of the British Royal Family....	2nd Life Guards
Royal Horse Guards	Regent's Park Regent's Park Regent's Park is one of the Royal Parks of London. It is in the north-western part of central London, partly in the City of Westminster and partly in the London Borough of Camden...	Royal Horse Guards Royal Horse Guards The Royal Horse Guards was a cavalry regiment of the British Army, part of the Household Cavalry.Founded August 1650 in Newcastle Upon Tyne by Sir Arthur Haselrig on the orders of Oliver Cromwell as the Regiment of Cuirassiers, the regiment became the Earl of Oxford's Regiment during the reign of...
1st	Aldershot Aldershot Aldershot is a town in the English county of Hampshire, located on heathland about southwest of London. The town is administered by Rushmoor Borough Council...	1st Dragoon Guards 5th Dragoon Guards 5th Dragoon Guards The 5th Dragoon Guards was a cavalry regiment in the British Army, first raised in 1685. It saw service for three centuries, before being amalgamated into the 5th Royal Inniskilling Dragoon Guards in 1922.... Glasgow Yeomanry Queen's Own Royal Glasgow Yeomanry The Queen's Own Glasgow can trace their formation back to the late 18th century, when King George III was on the throne, William Pitt the Younger was the Prime Minister of the United Kingdom, and across the English Channel, Britain was faced by a French nation that had recently guillotined its... Sherwood Rangers Sherwood Rangers Yeomanry The Sherwood Rangers Yeomanry is one of the five squadrons of the Royal Yeomanry , an armoured regiment of the Territorial Army. Designated as 'S' Squadron, the Sherwood Rangers Yeomanry's current role is to support the Formation Reconnaissance Regiments and the Joint Chemical Biological Nuclear...	Absorbed into 4th, 1917
2nd	Aldershot	2nd Dragoon Guards 6th Dragoons Essex Yeomanry Essex Yeomanry The Essex Yeomanry was a yeomanry regiment of the British Army raised in 1797. The regiment recruited volunteers from the county of Essex in the East of England.-Origins:... Lothian and Border Horse Lothian and Border Horse The Lothians and Border Horse was a Yeomanry regiment, part of the British Territorial Army. It was ranked 36th in the Yeomanry order of precedence, and based in the Scottish Lowland area, recruiting in the Lothian and along the border with England.-Origins:...	Absorbed into 4th, 1917
3rd	Canterbury Canterbury Canterbury is a historic English cathedral city, which lies at the heart of the City of Canterbury, a district of Kent in South East England. It lies on the River Stour....	3rd Dragoon Guards 3rd Dragoon Guards The 3rd Dragoon Guards was a cavalry regiment in the British Army, first raised in 1685. It saw service for three centuries, before being amalgamated into the 3rd/6th Dragoon Guards in 1922.... 6th Dragoon Guards Northamptonshire Yeomanry Northamptonshire Yeomanry The Northamptonshire Yeomanry was a unit of the British Army formed in 1794 as volunteer cavalry, it later served in an armoured role before being reduced to squadron level in 1956... Surrey Yeomanry Surrey Yeomanry The Surrey Yeomanry was a unit of the British Army formed as volunteer cavalry in 1794 during the French Revolutionary Wars. In 1901 the Regiment was granted the title Princess of Wales's which was changed to Queen Mary's when George V became the King... Sussex Yeomanry	Absorbed into 6th, 1917
4th	Tidworth Tidworth Tidworth is a town in south-east Wiltshire, England with a growing civilian population. Situated at the eastern edge of Salisbury Plain, it is approximately 10 miles west of Andover, 12 miles south of Marlborough, 24 miles south of Swindon, 15 miles north by north-east of Salisbury and 6 miles east...	4th Dragoon Guards 7th Dragoon Guards 7th Dragoon Guards The 7th Dragoon Guards was a cavalry regiment in the British Army, first raised in 1688. It saw service for three centuries, before being amalgamated into the 4th/7th Dragoon Guards in 1922.... Warwickshire Yeomanry Warwickshire Yeomanry The Warwickshire Yeomanry was a yeomanry regiment of the British Army, first raised in 1794, which served as a cavalry and dismounted infantry regiment in the First World War and as a cavalry and an armoured regiment in the Second World War, before being amalgamated into The Queen's Own... Royal Gloucestershire Hussars Royal Gloucestershire Hussars The Royal Gloucestershire Hussars was a unit of the British Army.Raised in 1795 following William Pitt's 1794 order to raise volunteer bodies of men to defend Great Britain, through various re-organisations, the Royal Gloucestershire Hussars remain today on the establishment of the Territorial... Worcestershire Yeomanry	Absorbed into 6th, 1917
5th	York York York is a walled city, situated at the confluence of the Rivers Ouse and Foss in North Yorkshire, England. The city has a rich heritage and has provided the backdrop to major political events throughout much of its two millennia of existence...	1st Dragoons 2nd Dragoons Northumberland Hussars Northumberland Hussars The Northumberland Hussars is a Squadron of The Queen's Own Yeomanry is an armoured Squadron of the British Territorial Army. It is part of a Formation Reconnaissance Regiment, equipped with the FV107 Scimitar and FV103 Spartan type armoured reconnaissance vehicles... Yorkshire Dragoons Queen's Own Yorkshire Dragoons The Queen's Own Yorkshire Dragoons was a unit of the British Army from 1794–1956.The regiment was formed as volunteer cavalry in 1794 during the French Revolutionary Wars. It was converted to an armoured role during World War II. In 1956 it merged with two other Yorkshire yeomanry regiments... Yorkshire Hussars Yorkshire Hussars The Yorkshire Hussars was a unit of the British Army from 1794 to 1956.The regiment was formed as volunteer cavalry in 1794 during the French Revolutionary Wars. It was converted to an armoured role during World War II. In 1956 it merged with two other Yorkshire yeomanry regiments to form the... East Riding Yeomanry	Absorbed into 6th, 1917
6th	Dublin	5th Lancers 12th Lancers City of London Yeomanry 1st County of London Yeomanry	Absorbed into 1st, 1917
7th	Tidworth	9th Lancers 21st Lancers 21st Lancers The 21st Lancers were a cavalry regiment of the British Army, created in 1858 and amalgamated to form the 17th/21st Lancers in 1922... Buckinghamshire Yeomanry Berkshire Yeomanry Berkshire Yeomanry 94 Signal Squadron forms part of 39 Signal Regiment. They are currently based in three locations in the Home Counties...	Absorbed into 1st, 1917
8th	The Curragh Curragh Camp The Curragh Camp is an army base and military college located in The Curragh, County Kildare, Ireland. It is the main training centre for the Irish Army.- Brief history of the Curragh's military heritage :...	16th Lancers 17th Lancers 17th Lancers The 17th Lancers was a cavalry regiment of the British Army, notable for its participation in the Charge of the Light Brigade in the Crimean War... Dorsetshire Yeomanry Queen's Own Oxfordshire Hussars Queen's Own Oxfordshire Hussars The Queen's Own Oxfordshire Hussars was the designated name of a Yeomanry regiment of the British Army between 1888 and 1922. In response a call by the government for troops of volunteers to be formed in the shires, meeting of “Nobility, Gentry, Freeholders and Yeomanry” was called at the Star Inn...	Absorbed into 1st, 1917
9th	Shorncliffe	3rd Hussars 7th Hussars 2nd County of London Yeomanry 3rd County of London Yeomanry	Absorbed into 2nd, 1917
10th	The Curragh	4th Hussars 8th Hussars Duke of Lancaster's Own Yeomanry Duke of Lancaster's Own Yeomanry The Duke of Lancaster's Own Yeomanry has its origins in the various troops of light horse raised in the eighteenth century in the county of Lancaster, the earliest of which was the Bolton Light Horse formed in 1798.... Lancashire Hussars Lancashire Hussars The Lancashire Hussars were originally formed in 1798 as independent troops, before becoming the Lancashire Yeomanry Cavalry in 1828 and then being disbanded in 1832... Westmorland and Cumberland Yeomanry Westmorland and Cumberland Yeomanry The Westmorland and Cumberland Yeomanry was a Yeomanry , Cavalry Regiment of the British Army formed in 1828. They were a part of the Imperial Yeomanry during the Boer War and would remain in Great Britain for the first years of the Great War but went to sail for France in 1917 to fight in the...	Absorbed into 2nd, 1917
11th	Tidworth	10th Hussars 18th Hussars Hampshire Yeomanry Hampshire Yeomanry The Hampshire Yeomanry can trace its formation to the late 18th century. King George III was on the throne, William Pitt the Younger was Prime Minister of Great Britain, and across the English Channel, Britain was faced by a French nation that had recently guillotined its King and which possessed... North Somerset Yeomanry North Somerset Yeomanry The North Somerset Yeomanry was first raised in Frome in 1798. A condition of service was that it should not be required to march more than 10 miles from the town and it was soon disbanded in 1802... Wiltshire Yeomanry	Absorbed into 5th, 1917
12th	Aldershot	11th Hussars 11th Hussars The 11th Hussars was a cavalry regiment of the British Army.-History:The regiment was founded in 1715 as Colonel Philip Honeywood's Regiment of Dragoons and was known by the name of its Colonel until 1751 when it became the 11th Regiment of Dragoons... 13th Hussars Leicestershire Yeomanry Leicestershire Yeomanry The Leicestershire Yeomanry was a yeomanry regiment of the British Army, first raised in 1794 and again in 1803, which provided cavalry and mounted infantry in the South African War and First World War and provided two field artillery regiments of the Royal Artillery in the Second World War,... Lincolnshire Yeomanry Lincolnshire Yeomanry The Lincolnshire Yeomanry was a volunteer cavalry unit of the British Army from 1794–1920.-Boer War:On 13 December 1899, the decision to allow volunteer forces serve in the Second Boer War was made... Staffordshire Yeomanry Staffordshire Yeomanry The Staffordshire Yeomanry was a unit of the British Army.Raised in 1794 following Prime Minister William Pitt's order to raise volunteer bodies of men to defend Great Britain from foreign invasion, the Staffordshire Yeomanry began as volunteer cavalry regiment. It first served overseas at the...	Absorbed into 3rd, 1917
13th	Colchester Colchester Colchester is an historic town and the largest settlement within the borough of Colchester in Essex, England.At the time of the census in 2001, it had a population of 104,390. However, the population is rapidly increasing, and has been named as one of Britain's fastest growing towns. As the...	14th Hussars 20th Hussars 20th Hussars The 20th Hussars was a cavalry regiment of the British Army. In 1922 it was amalgamated with the 14th Hussars to form the 14th/20th Hussars, later the 14th/20th King's Hussars.-History of the 20th Hussars:... Bedfordshire Yeomanry Bedfordshire Yeomanry Bedfordshire Yeomanry, a unit of the British Army originally raised in 1797 as a body of independent troops, the Bedfordshire Yeomanry Cavalry was disbanded after the Napoleonic Wars and briefly reformed from 1817 to 1827.... Hertfordshire Yeomanry Hertfordshire Yeomanry The Hertfordshire Yeomanry is a British Army unit specializing in artillery and yeomanry that can trace its formation to the late 18th century. First seeing service in the Boer War, it subsequently served in both World Wars....	Absorbed into 5th, 1917
14th	Longmoor Longmoor, Hampshire Not to be confused with Longmoor Military CampLongmoor is a place in Hampshire, England. The boundaries of Longmoor contains Longmoor Military Camp, a historic army camp and training area situated in the Longmoor Inclosure. It is now by the A3 road between Greatham and Liphook.The camp of Longmoor...	15th Hussars 19th Hussars Derbyshire Yeomanry Derbyshire Yeomanry The Derbyshire Yeomanry was a yeomanry regiment of the British Army, first raised in 1794, which served as a cavalry regiment and dismounted infantry regiment in the First World War and provided two reconnaissance regiments in the Second World War, before being amalgamated into The Leicestershire... South Nottinghamshire Hussars South Nottinghamshire Hussars The South Nottinghamshire Hussars were a unit of the British Army formed as volunteer cavalry in 1794. Converted to artillery in 1922, it now forms a battery of a Territorial Army regiment.-World War I:...	Absorbed into 3rd, 1917

Formed in 1916

Regiment	Location	Affiliated Regiments	Remarks
Household Cavalry	Windsor	Household Battalion Household Battalion The Household Battalion was an infantry battalion of the British army during the Great War. It was formed in September 1916 from the reserves of the Household Cavalry regiments to help fill the every-increasing demands for infantry on the Western Front...

After 1917 re-organization

Regiment	Location	Affiliated Regiments	Remarks
1st Life Guards	Hyde Park	1st Life Guards
2nd Life Guards	Windsor	2nd Life Guards
Royal Horse Guards	Regent's Park	Royal Horse Guards
Household Cavalry	Windsor	Household Battalion	Disbanded early 1918
1st	The Curragh	5th Lancers 9th Lancers 12th Lancers 16th Lancers 17th Lancers 21st Lancers Bedfordshire Yeomanry Lincolnshire Yeomanry City of London Yeomanry Surrey Yeomanry East Riding Yeomanry
2nd	The Curragh	3rd Hussars 4th Hussars 7th Hussars 8th Hussars Dorset Yeomanry Lancashire Hussars 1st Country of London Yeomanry 3rd County of London Yeomanry South Nottinghamshire Hussars Queen's Own Oxfordshire Hussars Westmorland and Cumberland Yeomanry
3rd	Aldershot	11th Hussars 13th Hussars 15th Hussars 19th Hussars Buckinghamshire Yeomanry Leicestershire Yeomanry Staffordshire Yeomanry Wiltshire Yeomanry Sherwood Rangers
4th	Aldershot	1st Dragoon Guards 2nd Dragoon Guards 5th Dragoon Guards 6th Dragoons Derbyshire Yeomanry Essex Yeomanry Glasgow Yeomanry Hampshire Yeomanry County of London Yeomanry Lothian and Border Horse
5th	Tidworth	10th Hussars 14th Hussars 18th Hussars 20th Hussars Northumberland Hussars Yorkshire Hussars Warwickshire Yeomanry Royal Gloucestershire Hussars Worcestershire Yeomanry
6th	Tidworth	3rd Dragoon Guards 4th Dragoon Guards 6th Dragoon Guards 7th Dragoon Guards 1st Dragoons 2nd Dragoons Berkshire Yeomanry Hertfordshire Yeomanry Duke of Lancaster's Own Yeomanry Northamptonshire Yeomanry North Somerset Yeomanry Yorkshire Dragoons