The Yeomanry regiments were mounted units of the Territorial Force.
The composition details given below come from “War Establishments of the Scottish Horse Mounted Brigade” dated August 1915 but apply to all such regiments.
Regimental Headquarters
Officers 4 (Lieutenant-Colonel in command; Major 2-in-C; Adjutant; Quartermaster)
Officers 6 others, attached (Medical Officer RAMC; Veterinary Officer AVC; 4 Interpreters)
Staff-Sergeants and Sergeants 5 (Acting Regimental Sergeant Major; Regimental Quartermaster Sergeant; Transport Sergeant; Acting Sergeant-Cook; Acting Sergeant-Trumpeter)
Artificers 2 (Farrier Quartermaster-Sergeant; Saddler-Sergeant)
Artificers 1 other, attached (Armourer AOC)
Men 16 (Orderly Room Clerk; Orderly attached to CO; 2 Orderlies attached to MO; Orderly attached to VO; 11 officers’ batmen)
Men 12 others, attached (3 RAMC; 5 ASC; 4 interpreters’ batmen)
Total: officers 10, other ranks 36
Horses 33 riding; 12 draught.
Bicycles 5.
Machine Gun Section
Officer 1 (Subaltern)
Sergeant 1
Corporal 1
Privates 12
Drivers 8
Batmen 2
Total: officers 1, other ranks 24
Horses 17 riding; 16 draught.
Squadrons
A regiment had three Squadrons when on active service.
Officers 18 (1 Major, 1 Captain, 4 Subalterns in each Sqn)
Staff-Sergeants and Sergeants 30 (Squadron Sergeant-Major; Squadron Quartermaster Sergeant; 8 Sergeants in each Sqn)
Artificers 21 (1 Farrier Sergeant, 5 Shoeing Smiths, 1 Saddler in each Sqn)
Trumpeters 6 (2 per Sqn)
Men 345 (8 Corporals, 90 Privates, 5 Drivers, 12 batmen in each Sqn)
Men 6 others, attached (2 ASC Drivers in each Sqn)
Total: officers 18, other ranks 408
Horses 393 riding; 48 draught and pack.
Exceptions
Despite its name, the First Aid Nursing Yeomanry was not a Yeomanry regiment and the above details do not apply to it.