The 1st Cavalry Division was a regular Division of the British Army during the First World War where it fought on the Western Front. During the Second World War it was a first line formation, formed from Yeomanry Regiments. It fought in the Middle East before being converted to the 10th Armoured Division.
The Leicestershire Yeomanry (Prince Albert's Own) was a yeomanry regiment of the British Army, first raised in 1794 and again in 1803, which provided cavalry and mounted infantry in the Second Boer War and the First World War and provided two field artillery regiments of the Royal Artillery in the Second World War, before being amalgamated with the Derbyshire Yeomanry to form the Leicestershire and Derbyshire (Prince Albert's Own) Yeomanry in 1957. The regiment's lineage is currently perpetuated by E (Leicestershire and Derbyshire Yeomanry) Squadron of the Royal 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 with the Leicestershire Yeomanry to form the Leicestershire and Derbyshire Yeomanry in 1957.
The Lancashire Hussars was a British Army unit originally formed in 1798. It saw action in the Second Boer War, the First World War and the Second World War. In 1969, the regiment reduced to a cadre and the Yeomanry lineage discontinued.
The 3rd Mounted Division was a Yeomanry Division of the British Army active during World War I. It was formed on 6 March 1915 as the 2/2nd Mounted Division, a replacement/depot formation for the 2nd Mounted Division which was being sent abroad on active service. In March 1916, it was renumbered as the 3rd Mounted Division and in July 1916 as the 1st Mounted Division. In September 1917, the division was reorganized as a cyclist formation and redesignated as The Cyclist Division. It remained in the United Kingdom throughout the war and was disbanded in June 1919.
The 1st Mounted Division was a Yeomanry Division of the British Army active during World War I. It was formed in August 1914 for the home defence of the United Kingdom from four existing mounted brigades of the Territorial Force, each of three regiments of Yeomanry. The divisional order of battle changed often, as the 1st Line brigades left for service overseas and were replaced by 2nd Line formations. It was converted to the 1st Cyclist Division in July 1916, and was broken up in November 1916 without being involved in active service. It remained in East Anglia throughout its existence.
The Yorkshire Hussars was an auxiliary unit of the British Army formed in 1794. The regiment was formed as volunteer cavalry (Yeomanry) in 1794 during the French Revolutionary Wars and served in the Second Boer War and the First World War. It was converted to an armoured role during the Second World War. In 1956, it merged with two other Yorkshire yeomanry regiments to form the Queen's Own Yorkshire Yeomanry. Its lineage is continued today by the Queen's Own Yeomanry.
The Queen's Own Yorkshire Dragoons was a yeomanry regiment of the British Army in existence from 1794 to 1956. It was formed as a volunteer cavalry force in 1794 during the French Revolutionary Wars. Its volunteer companies played an active role with the Imperial Yeomanry in the Second Boer War, but opportunities for mounted action were much more restricted during the First World War and it was temporarily converted into a cycle unit. It remained a cavalry regiment throughout the interwar years, and was the last horsed unit of the British Army to see action, in the Syria–Lebanon Campaign of 1941, finally mechanising the following year. It served as motorised infantry in the North African and Italian campaigns of the Second World War. In 1956, it merged with the Yorkshire Hussars and the East Riding of Yorkshire Yeomanry to form the Queen's Own Yorkshire Yeomanry. Its lineage is continued today by A Squadron, the Queen's Own Yeomanry.
The East Riding of Yorkshire Yeomanry was a unit of the British Army formed in 1902. Units of Yeomanry Cavalry were raised in the East Riding of Yorkshire in the 18th and early 19th centuries at times of national emergency: the Jacobite Rising of 1745, the French Revolutionary Wars and the Napoleonic Wars. These were stood down once each emergency was over. The East Riding of Yorkshire Yeomanry, was established in 1902, and this saw action during the First World War both in the mounted role and as machine gunners.
The Royal Buckinghamshire Yeomanry is an Operational Hygiene Squadron of the Royal Logistic Corps, originally formed as cavalry in 1794, and has also served in artillery and signals roles. The lineage is continued by 710 Operational Hygiene Squadron, Royal Logistic Corps.
The 2nd South Midland Mounted Brigade was a yeomanry brigade of the British Army, formed as part of the Territorial Force in 1908.
The Yorkshire Mounted Brigade was a formation of Britain's part-time Territorial Force organised in 1908. Mobilised on the outbreak of World War I, its regiments had been posted away by 1915 so it was broken up. It never saw active service.
The 8th Cavalry Brigade was a cavalry brigade of the British Army in World War I. It was formed in Belgium in 1914 and served on the Western Front as part of the 3rd Cavalry Division. It left the 3rd Cavalry Division on 14 March 1918.
The British yeomanry during the First World War were part of the British Army reserve Territorial Force. Initially, in 1914, there were fifty-seven regiments and fourteen mounted brigades. Soon after the declaration of war, second and third line regiments were formed. However, the third line regiments were soon absorbed into the Cavalry Reserve Regiments, to supply replacements for the cavalry and yeomanry. Other horsed regiments in the British Army, during the war, were the regular cavalry regiments and the three regiments belonging to the special reserve: the North Irish Horse, the South Irish Horse and the King Edward's Horse. The senior yeomanry regiments could trace their origins back over 100 years; the oldest regiment, the Royal Wiltshire Yeomanry, had been formed in 1794. The most junior regiment, the Welsh Horse, had only been formed on 18 August 1914, after the start of the war.
Yeomanry are part of the reserve for the British Army. At the start of First World War there were fifty-four yeomanry regiments in the British Army. Soon after the declaration of war, it was decided to increase the number of these volunteer mounted regiments. The new regiments were mirror formations of the existing first line regiments, with the same name and served initially in the same brigades. However they were all classed as second line units. The first line regiments, were numbered the 1/1st while the second line became the 2/1st or in cases where there were more regiments with the same name, or already numbered, the 2/2nd or 2/3rd.
The 21st Mounted Brigade previously known as the 2/1st Western Mounted Brigade was a 2nd Line yeomanry brigade of the British Army during the First World War. In July 1916 it was converted to a cyclist formation as 14th Cyclist Brigade and in October 1916 was redesignated as 10th Cyclist Brigade. It was still in existence, in Ireland, at the end of the war.
The 17th Mounted Brigade previously known as the 2/1st Welsh Border Mounted Brigade was a 2nd Line yeomanry brigade of the British Army during the First World War. In July 1916 it was converted to a cyclist formation as 10th Cyclist Brigade and in November 1916 was redesignated as 6th Cyclist Brigade. It was still in existence, in Ireland, at the end of the war.
The 20th Mounted Brigade previously known as the 2/1st Lowland Mounted Brigade was a 2nd Line yeomanry brigade of the British Army during the First World War. In July 1916 it was converted to a cyclist formation as 13th Cyclist Brigade and in November 1916 was redesignated as 9th Cyclist Brigade. It was still in existence, in Ireland, at the end of the war.
The 19th Mounted Brigade previously known as the 2/1st Scottish Horse Mounted Brigade was a 2nd Line yeomanry brigade of the British Army during the First World War. In July 1916 it was converted to a cyclist formation as 12th Cyclist Brigade and redesignated as 8th Cyclist Brigade in November 1916. It was still in existence, in Ireland, at the end of the war.
United Kingdom 
British Army 