Mobilisation The Hertfordshire Yeomanry completed its 1914 annual camp at the end of the first week in June. On the outbreak of
World War I the embodiment of the TF was proclaimed on 4 August and the regiment mobilised at its squadron HQs next day. The men were
billeted nearby until they had been equipped and the horses requisitioned, and then set off on the two-day march to their war station at
Mountnessing,
Essex, to link up with Eastern Mounted Brigade. The regiment was moved around Essex and
Suffolk, finally reaching
Culford, near
Bury St Edmonds, on 21 August. Under the
Territorial and Reserve Forces Act 1907 (
7 Edw. 7, c.9), the TF was intended as a home defence force and its members could not be compelled to serve outside the country. However, after the outbreak of war, TF units were invited to volunteer for Overseas Service. The Herts Yeomanry held squadron parades at Culford on 22 August where the officers and men were invited to volunteer, and more than 80 per cent of the regiment did so at once. On 31 August 1914, the
War Office authorised the formation of Reserve or 2nd-Line units for each existing TF unit where 60 per cent or more of the men had volunteered. Initially these were formed from men who had not volunteered or were unfit for overseas service, and the recruits who were flooding in. The titles of these 2nd Line units would be the same as the original, but they were distinguished by '1/' and '2/' prefixes. In this way duplicate units were created, mirroring those being sent overseas. Later they were mobilised for active service in their own right and 3rd Line units were created to supply reinforcement drafts to the 1st and 2nd Lines.
1/1st Hertfordshire Yeomanry On 31 August the 1/1st Herts Yeomanry was warned for service in
Egypt. The regiment's CO, Lt-Col Abel Smith, was not passed medically fit for overseas service, so Col T.E. Harrison,
DSO, retired from the
Leicestershire Yeomanry, was 'dug out' to take the 1/1st Herts Yeomanry overseas. Lieutenant-Col Abel Smith took command of the 2/1st Herts Yeomanry. The war establishment of a cavalry regiment overseas was three rather than four squadrons: C Sqn 1/1st Herts Yeomanry was broken up and the manpower distributed to the other three; its officer commanding, Maj Reginald Halsey, formed the Regimental Depot at RHQ, but had rejoined 1/1st Herts Yeomanry before it sailed. In February 1915 1/1st Herts Yeomanry joined the
Yeomanry Mounted Brigade formed to pursue to the Turks who had carried out a
Raid on the Suez Canal: it gained the Battle Honours
Suez Canal and
Egypt 1915 without firing a shot. In August 1915 the brigade (now designated 5th Mounted Brigade) was sent to the
Gallipoli Campaign as dismounted troops attached to the
2nd Mounted Division. The regiment was engaged in the disastrous
Battle of Scimitar Hill and then served in the trenches until November. Casualties from
Trench warfare and sickness were such that by September the 1/1st Herts Yeomanry and the
Westminster Dragoons were temporarily combined as
5th Yeomanry Regiment in
1st Composite Mounted Brigade. After the evacuation of Gallipoli the regiment returned to Egypt in November 1915 and was remounted. It was able to raise two mounted squadrons in December for service with the
Western Frontier Force for the
Senussi Campaign. In February 1916 the regiment was split up to provide divisional cavalry squadrons to the infantry divisions evacuated from Gallipoli: • Regimental HQ with A Sqn and the MG Section were attached to
54th (East Anglian) Division and served with it at the
First and
Second Battles of Gaza. In August 1917 A Squadron joined
XXI Corps Cavalry Regiment. • B Squadron was attached to
11th (Northern) Division and accompanied it to the
Western Front, where on 12 July 1916 it joined
VI Corps Cavalry Regiment, until early in 1917 when it moved to join
XVIII Corps Cavalry Regiment. In July 1917 the squadron returned to Egypt, where it served as the depot squadron in the Cavalry Wing of the Imperial School of Instruction at
Zeitoun. • D Squadron was attached to
13th (Western) Division and went with it to the
Mesopotamian campaign. On 1 January 1917 it joined
III (Tigris) Corps Cavalry Regiment for the
Second Battle of Kut. It reverted to 13th (W) Division in March and was one of the first British units to
enter Baghdad. The squadron later served with
15th Indian Division on the
Euphrates and on the lines of communication for the
North Persia Force until the end of the war. Before
demobilisation, the squadron served as part of an internal security unit in
Calcutta.
XXI Corps Cavalry A Squadron 1/1st Herts Yeomanry joined XXI Corps Cavalry Regiment on 26 August 1917. The other two squadrons of the regiment were A Sqn
1/1st Duke of Lancaster's Own Yeomanry and C Sqn
1/1st Queen's Own Royal Glasgow Yeomanry (QORGY). In November the composite regiment formed part of the pursuing force after the
Third Battle of Gaza. In May 1918 B Sqn 1/1st Herts Yeomanry at Zeitoun exchanged with C Sqn QORGY, and both Herts squadrons served together in XXI Corps Cavalry Regiment for the rest of the war. The regiment fought in the final
Battle of Megiddo and then carried out an epic march up the coast of
Ottoman Syria to liberate the ports.
2/1st Hertfordshire Yeomanry The 2nd Line regiment was formed under Lt-Col Abel Smith at Hertford on 1 September 1914 and quickly recruited up to the war establishment for a yeomanry regiment. The Hertfordshire Territorial Association was able rapidly to provide uniforms and reasonably modern equipment. It spent the winter of 1914–15 in billets at Hertford then took over the old militia barracks in the town with temporary stabling when the horses arrived. In mid-1915 the 3rd Line regiment took over the role of draft-finding for the 1/1st Herts Yeomanry overseas, and the remaining home service men were transferred to join a squadron to a Provisional Brigade. The 2/1st left Hertford in June 1915 for two months' training on
Epsom Downs, and then went to the
Thetford–
Brandon area to join
69th (2nd East Anglian) Division in
First Army of
Central Force, responsible for the defence of Eastern England. At the end of October it moved into winter quarters in billets in
Huntingdon. In February 1916 Lt-Col Abel Smith, who was no longer fit for active service, moved to the Regimental Depot; Maj J.B. Gilliat (who had commanded 42nd (Herts) Company, IY, in the Boer War) was promoted to take command. On 28 April 1916 the regiment joined the
16th (2/1st Southern) Mounted Brigade of the
4th Mounted Division in the
Manningtree area. The division's role was to be a mobile reserve in case of invasion and was regularly on alert, such as during the
Battle of Jutland. In July 1916 4th Mounted Division was converted into a
Bicycle infantry division, but 2/1st Herts Yeomanry was one of three of its regiments selected to remain mounted, and it was exchanged into
3rd Mounted Bde of
1st Mounted Division in General Reserve of Home Forces, with the regiment billeted at
Westerham. Despite some false alerts of invasion or riot duty, and rumours that the division was to be sent overseas, the regiment remained in Kent. In the spring of 1917 it moved to
Wildernesse, near
Sevenoaks, and carried out mounted training in
Knole Park. However, by mid-August 1917 the 1st Mounted Division was also converted to cyclists (as
The Cyclist Division), and 2/1st Herts Yeomanry gave up its horses and converted to the four-company organisation of a cyclist battalion, except one mounted squadron that joined
6th Reserve Cavalry Regiment. The role of the Cyclist Division was to train and provide reinforcement drafts for cycle units serving overseas, but many of the remaining trained cavalrymen were transferred to the reserve cavalry regiments. 2/1st Hertfordshire Yeomanry remained in 3rd Mounted Bde (renamed 13th Cyclist Bde) but on 26 October it transferred under conditions of secrecy to
214th (Special) Bde in
71st Division. Popularly known as the 'Hush Brigade', this force was being assembled at
Colchester for operations at
Murmansk. The regiment moved into billets at
West Bergholt and was brought up to establishment with men of 'A1' medical category: Lt-Col Gilliat reverted to the retired list and Lt-Col W. Byron of the Leicestershire Yeomanry assumed the command. The battalion was issued with steel helmets and trained for beach landings from naval destroyers, to wade ashore with their bicycles on their shoulders. 71st Division was broken up at the beginning of 1918 and on 12 February 214th Bde joined
67th Division, still at Colchester. The brigade retained its special mission, but this was cancelled in March after the
German Spring Offensive was launched on the
Western Front. The regiment immediately supplied large numbers of A1 men as infantry reinforcements for the Western Front, and continued to do so in its depleted state for the rest of the war, taking in men from disbanded units and recruits from training regiments and preparing them for active service. It was demobilised at
Ipswich in January 1919.
3/1st Hertfordshire Yeomanry The 3rd Line regiment was formed at Hertford in December 1914 and received its formal designation in January 1915. At first in squadron strength, it was commanded by Maj E.J. Upton, transferred to the Herts Yeomanry from the Eastern Mounted Bde's Transport and Supply Column of the
Army Service Corps. In April 1915 it absorbed all the training staff from 2/1st Herts Yeomanry and assumed its role of training reinforcements. In March it had been affiliated to the
13th Reserve Cavalry Regiment at
Colchester, and from June it sent all its trained men to a separate squadron with this regiment, retaining only the training staff and incoming recruits at Hertford. In November the establishment of 3rd Line Yeomanry regiments was increased to match the 2nd Line, so 3/1st Herts Yeomanry reorganised with RHQ and two squadrons at Hertford and the 'Overseas' Squadron at Colchester. However, in April 1916 the 3rd Line Yeomanry regiments were ordered to join their affiliated reserve cavalry regiments, and 3/1st Herts Yeomanry joined 13th Reserve Rgt, which had just moved to
Maresfield in
Sussex. Here 3/1st Herts Yeomanry was assembled as a full regiment for the first time, under the command of Maj Barré A.H. Goldie, with a basic training squadron, a continuation training squadron, and the overseas squadron holding men waiting to be drafted. However, with the exception of Palestine there was little requirement for cavalry during World War I, and the large cavalry training organisation was reduced in February 1917. 3/1st Hertfordshire Yeomanry was absorbed into the reorganised
6th Reserve Cavalry Regiment at
Tidworth Camp, which was responsible for training reinforcements for dragoon regiments. The new unit supplied its first draft to 1/1st Herts Yeomanry in April 1917. ==Interwar==