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Seventeen Cavalry Reserve Regiments were formed by the British Army on the outbreak of the Great War in August, 1914.[1] These were affiliated with one or more active cavalry regiments, their purpose being to train replacement drafts for the active regiments. In 1915, the 3rd (i.e. training) Regiments of the Yeomanry 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. 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 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, was dispatched to investigate a "disturbance" at Dublin Castle.[2] 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. 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 to support the local Dublin garrison.[3]

Original August 1914 Formations[]

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
1st Aldershot 1st Dragoon Guards
5th Dragoon Guards
Glasgow Yeomanry
Sherwood Rangers
Absorbed into 4th, 1917
2nd Aldershot 2nd Dragoon Guards
6th Dragoons
Essex Yeomanry
Lothian and Border Horse
Absorbed into 4th, 1917
3rd Canterbury 3rd Dragoon Guards
6th Dragoon Guards
Northamptonshire Yeomanry
Surrey Yeomanry
Sussex Yeomanry
Absorbed into 6th, 1917
4th Tidworth 4th Dragoon Guards
7th Dragoon Guards
Warwickshire Yeomanry
Royal Gloucestershire Hussars
Worcestershire Yeomanry
Absorbed into 6th, 1917
5th York 1st Dragoons
2nd Dragoons
Northumberland Hussars
Yorkshire Dragoons
Yorkshire Hussars
East Riding Yeomanry
Absorbed into 6th, 1917
6th Dublin 5th (Royal Irish) Lancers
12th Lancers
City of London Yeomanry
1st County of London Yeomanry
Absorbed into 1st, 1917
7th Tidworth 9th Lancers
21st Lancers
Buckinghamshire Yeomanry
Berkshire Yeomanry
Absorbed into 1st, 1917
8th The Curragh 16th Lancers
17th Lancers
Dorsetshire Yeomanry
Queen's Own Oxfordshire Hussars
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
Lancashire Hussars
Westmorland and Cumberland Yeomanry
Absorbed into 2nd, 1917
11th Tidworth 10th Hussars
18th Hussars
Hampshire Yeomanry
North Somerset Yeomanry
Wiltshire Yeomanry
Absorbed into 5th, 1917
12th Aldershot 11th Hussars
13th Hussars
Leicestershire Yeomanry
Lincolnshire Yeomanry
Staffordshire Yeomanry
Absorbed into 3rd, 1917
13th Colchester 14th Hussars
20th Hussars
Bedfordshire Yeomanry
Hertfordshire Yeomanry
Absorbed into 5th, 1917
14th Longmoor 15th Hussars
19th Hussars
Derbyshire Yeomanry
South Nottinghamshire Hussars
Absorbed into 3rd, 1917

Formed in 1916[]

Regiment Location Affiliated Regiments Remarks
Household Cavalry Windsor Household Battalion

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
2nd 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

References[]

  1. The Cavalry Reserve Regiments The Long, Long Trail
  2. Ciaran Byrne, The Harp and Crown, the History of the 5th (Royal Irish) Lancers, 1902 - 1922, p. 105
  3. General J.G. Maxwell, From the General Officer, Commanding-in-Chief, The Forces in Ireland. To the Field-Marshal, Commanding-in-Chief, The Home Forces. 25th May, 1916


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