The 2nd Mounted Division was a yeomanry division that served in the First World War. At the outbreak of war it was assigned to defence of the Norfolk coast. In March 1915 it formed a 2nd Line duplicate of itself, the 2/2nd Mounted Division. Leaving the 2/2nd on coastal defence, it then fought at Gallipoli from April to December 1915, under the command of Major General William Peyton, before being disbanded in January 1916.
The Lanarkshire Yeomanry was a yeomanry regiment of the British Army, first raised in 1819, which served as a dismounted infantry regiment in the First World War and provided two field artillery regiments in the Second World War, before being amalgamated into The Queen's Own Lowland Yeomanry in 1956. Its lineage was revived by B Squadron, the Scottish Yeomanry in 1992 until that unit was disbanded in 1999.
The Ayrshire Yeomanry was a Regiment of the British Yeomanry and is now an armoured Squadron of the Scottish and North Irish Yeomanry (SNIY), part of the British Army Reserve. It is the Lowlands of Scotland's only Royal Armoured Corps Unit and has an unbroken history stretching back to the 1790s.
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 was based in the Scottish Lowland area, recruiting in the Lothians – East Lothian (Haddingtonshire), Midlothian (Edinburghshire), and West Lothian (Linlithgowshire) – and along the border with England, particularly Berwickshire. It amalgamated with the Lanarkshire Yeomanry and the Queen's Own Royal Glasgow Yeomanry to form the Queen's Own Lowland Yeomanry in 1956.
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 Queen's Own Royal Glasgow Yeomanry was a yeomanry regiment of the British Army that can trace their formation back to 1796. It saw action in the Second Boer War, the First World War and the Second World War. It amalgamated with the Lanarkshire Yeomanry and the 1st/2nd Lothians and Border Horse to form the Queen's Own Lowland Yeomanry in 1956. Its lineage was revived by B Squadron, the Scottish Yeomanry in 1992 until that unit was disbanded in 1999.
The 4th Mounted Division was a short-lived Yeomanry Division of the British Army active during World War I. It was formed on 20 March 1916, converted to 2nd Cyclist Division in July 1916 and broken up on 16 November 1916. It remained in England on Home Defence duties throughout its existence.
The 2nd Dismounted Brigade was a formation of the British Army in the First World War. It was formed in Egypt in February 1916 by absorbing the Highland Mounted Brigade and the 2nd South Western Mounted Brigade. In October it absorbed the remnants of the 1st Dismounted Brigade. The brigade served as part of the Western Frontier Force and the Suez Canal Defences.
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 Eastern Mounted Brigade was a formation of the Territorial Force of the British Army, organised in 1908. After serving dismounted in the Gallipoli Campaign, it was absorbed into the 3rd Dismounted Brigade in Egypt in February 1916.
The Royal 1st Devon Yeomanry was a Yeomanry regiment of the British Army. First raised in 1794, it participated in the Second Boer War and the First World War before being amalgamated with the Royal North Devon Yeomanry in 1920 to form the Royal Devon Yeomanry.
The 1st Dismounted Brigade was a formation of the British Army in World War I. It was formed in Egypt in February 1916 by absorbing the Lowland and Scottish Horse Mounted Brigades. The brigade was on Suez Canal defences attached to the 52nd (Lowland) Division and was broken up in October 1916.
The Lowland Mounted Brigade was a formation of the Territorial Force of the British Army, organised in 1908. After service in the Gallipoli Campaign, it was absorbed into the 1st Dismounted Brigade in February 1916.
The 1st South Western Mounted Brigade was a formation of the Territorial Force of the British Army, organised in 1908. By 1915 its regiments had been posted away so it was broken up; it never saw active service as a brigade. The Headquarters may have formed the HQ for 2/1st Southern Mounted Brigade.
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 West Riding Royal Horse Artillery was a Territorial Force Royal Horse Artillery battery that was formed in the West Riding of Yorkshire in 1908. It saw active service as field artillery with 52nd (Lowland) Division in Egypt during the First World War before being broken up at the end of 1916. Post-war, it was reconstituted as a Royal Field Artillery battery.
The Hampshire Royal Horse Artillery was a Territorial Force Royal Horse Artillery battery that was formed in Hampshire in 1909. It saw active service during the First World War in Egypt and Palestine from 1916 to 1918, initially as field artillery with 52nd (Lowland) Division before being converted back to horse artillery and serving with the Yeomanry Mounted Division and 1st Mounted / 4th Cavalry Division. A second line battery, 2/1st Hampshire RHA, served on the Western Front in 1917 and 1918 as part of an Army Field Artillery Brigade. Post-war, it was reconstituted as a Royal Field Artillery battery.
The Ayrshire Royal Horse Artillery was a Territorial Force Royal Horse Artillery battery that was formed in Ayrshire in 1908. It saw active service during the First World War in the Sinai and Palestine Campaign with the ANZAC Mounted Division from 1916 to 1918. It was disembodied after the end of the war and was not reconstituted in the post-war Territorial Force.
United Kingdom 
British Army 