At the outbreak of the
World War I, the regiment mobilised at County Territorial Hall, Taunton, on 4 August 1914 and moved to
Winchester. On 15 August it moved with the 2nd South Western Mounted Bde to the
Colchester area of
Essex, with the regiment at
Ardleigh. Under the
Territorial and Reserve Forces Act 1907 (
7 Edw. 7, c.9) which brought the TF into being, it was intended to be a home defence force for service during wartime and members could not be compelled to serve outside the country. However, on the outbreak of war, TF units were invited to volunteer for Overseas Service. On 15 August 1914, the
War Office issued instructions to separate those men who had signed up for Home Service only, and form these into reserve units, then on 31 August, the formation of a reserve or 2nd Line unit was authorised for each 1st Line unit where 60 per cent or more of the men had volunteered for Overseas Service. The titles of these 2nd Line units would be the same as the original, but distinguished by a '2/' prefix. In this way duplicate battalions, brigades and divisions were created, mirroring those TF formations being sent overseas. Early in 1915 a 3rd Line was formed to act as a reserve, providing trained replacements for the 1st and 2nd Line regiments.
1/1st West Somerset Yeomanry The 1/1st West Somerset Yeomanry remained in Essex for the next year, moving to
Great Bentley in October 1914 and
Tendring the following month.
Gallipoli 1915 The 1/2nd South Western Mounted Bde arrived at
Mudros on 1 October, transferred to the
SS Osmanieh and sailed for
Suvla Bay. It landed on 9 October and was attached to
11th (Northern) Division. The 1/1st WSY
bivouacked at 'Oxford Street' at Karakol Dagh. It began work on digging trenches and suffered its first casualties. On 3 November the brigade did its first tour of duty in the firing line, with 1/1st WSY relieving 9th Battalion
Lancashire Fusiliers in the forward trenches at 'Lone Tree Gully'. It was relieved by 9th Bn
Sherwood Foresters on 11 November and returned to Oxford St, later marching via Lala Baba and Salt Lake to the A Section support trenches. The 1/2nd South Western Mounted Bde was attached to the 2nd Mounted Division from 15 November, and the 1/1st WSY took over forward trenches in 'White House' sector on 18 November, with its HQ at 'Pope's Seat'. It was relieved by the
1/1st Royal North Devon Yeomanry on 24 November and went back to the support line at 'Willow Tree', 'Cater's House' and 'Tint's Corner', but on 27 November B Sqn was sent up to reinforce the North Devons in the firing line and next day C Sqn similarly reinforced
1/1st Royal 1st Devon Yeomanry. This was during a severe storm that turned into a blizzard. The brigade, and
53rd (Welsh) Division to which it had just been attached, suffered large numbers of casualties due to the weather as well as battle casualties – on 29 November the Willow Tree position was badly shelled. By the time the 1/1st WSY was relieved and went back to Lala Baba, it had suffered casualties of 3 officers and 78 other ranks in the period 27–29 November. Its strength was down to 294 by 2 December, with many men sick in hospital, and it dwindled to 111 by 4 December. The 1/2nd South Western Mounted Bde was attached to 2nd Mounted Division again on 9 December, and the remnant of 1/1st WSY returned to the Willow Tree sector next day. However, the decision had been made to shut down the campaign, and the Suvla sector was evacuated first. 1/1st West Somerset Yeomanry was embarked during the last night of the operation, 19/20 December, when the secret evacuation was achieved without a single casualty. The regiment was taken first to
Imbros and then re-embarked for Egypt.
Egypt 1916–17 In December 1915 the regiment landed in
Alexandria. In February 1916, 1/2nd South Western Mounted Bde was absorbed into the
2nd Dismounted Brigade (along with elements of the
Highland and
Lowland Mounted Brigades) in the
Western Frontier Force (WFF). By the end of 1916 the 2nd Dismounted Bde was in the
Suez Canal defences. The
Egyptian Expeditionary Force (EEF) was about to cross the
Sinai Peninsula and begin its
invasion of Palestine, and began the process of turning the dismounted yeomanry into a new infantry division for this campaign. On 4 January 1917, 1/1st West Somerset Yeomanry was converted at
Ismaïlia to form the
12th (West Somerset Yeomanry) Battalion, Somerset Light Infantry and on 14 January 2nd Dismounted Brigade became
229th Infantry Brigade. A new
74th (Yeomanry) Division began to form on 4 March, and 229th Bde joined it at
El Arish on 9 March.
Palestine 1917–18 Apart from artillery, the 74th (Y) Division was fully assembled in time for the
Second Battle of Gaza. It took over the outpost line on 7 April and was in reserve for the attacks on 17 and 19 April but was not engaged. It was able to complete its organisation and training in the pause before the
Third Battle of Gaza began on 27 October. While Turkish attention was fixed on
Gaza City by a heavy bombardment from land and sea,
XX Corps, including 74th (Y) Division led by 229th Bde, made a night approach march on 30/31 October to attack
Beersheba on the Turks' landward flank. The other two brigades of the division then attacked through the dust clouds of the preliminary bombardment at 12.15 next day, while the Desert Mounted Corps swept round the flank and into Beersheba itself. The
Battle of Beersheba was a resounding success, and XX Corps pressed on northwards as the Turks fell back to the Sheria Position. 229th Brigade led 74th (Y) Division's pre-dawn attack on this position on 8 November, without preliminary bombardment or barrage. Shortly after 06.00 the brigade had captured a series of strongpoints and moved onto the next group of works. Here the fighting was tougher, and two counter-attacks had to be driven off, but after a short pause for reorganisation, 229th Bde began rolling up the Turkish line, reaching its final objective (the Beersheba railway) at 13.15. While the mounted troops pursued the beaten enemy, 74th (Y) Division paused and re-equipped with winter clothing for the next phase of the campaign. By 25 November the division was about four days' march behind the fighting line, but it was brought up for the advance into the
Judaean Hills towards
Jerusalem. The Turks launched strong counter-attacks on 27 and 28 November, and 74th (Y) Division began arriving to reinforce the position on 29 November. The leading brigade was thrown into a confused situation and 229th Bde moved in on 30 November to restore the line but one outpost could not be permanently recovered even after hard fighting that continued until 3 December. However, on 8 December the EEF launched its final attack on Jerusalem. 74th (Y) Division's attack on a narrow front was carried out by two battalions of 229th Bde: 12th (Ayr & Lanark Yeomanry) Bn
Royal Scots Fusiliers in the lead, and 12th (WSY) Somerset LI in support. The enemy was fast asleep as the troops descended into the bed of the Wadi Buwai and scaled the steep ascent on the other side. After a short fight the Turkish trench was captured with numerous prisoners. Next day
Jerusalem surrendered and 229th Bde's advance reached its objective north of the city without any fighting. The division was then engaged in road-making for most of the month while the EEF defended Jerusalem against Turkish counter-attacks. The division resumed its advance on 27 December as the EEF established a strong defence line. 74th (Y) Division then went into reserve. By March the EEF was ready to advance into the
Jordan Valley. 229th Brigade made its approach march to Lake Balua, north of
Bire, on the
Nablus road north of Jerusalem. Then on the night of 8 March XX Corps advanced on the high ground of Tell 'Asur dominating the valley. 53rd (Welsh) and 60th (2/2nd London) Divisions secured the hill after bitter fighting on 9 March, and after nightfall 74th (Y) Division resumed its advance astride the Nablus road. 229th Brigade was in support as the division struggled over the rough country, capturing 'Yeoman's Hill' on 10 March. The
Battle of Tell 'Asur was 74th (Y) Division's last action in the campaign: on 3 April 1918 it was warned that it would move to the
Western Front, where the
German Spring Offensive was under way. By 30 April 1918 the division had completed embarkation at Alexandria. , and the 12th (West Somerset Yeomanry) Bn, Somerset Light Infantry, at the Regimental Aid Post near
Carvin, France, 14 August 1918
France and Flanders 1918 On 7 May 1918, 12th (WSY) Bn, Somerset LI, landed at
Marseille, France, with 74th (Y) Division. The division concentrated in the
Abbeville area and underwent training for Western Front fighting, particularly
anti-gas measures. On 31 May the division went into GHQ Reserve while it continued training. It went into the line on 14 July near
Merville. Fourth Army then pursued the Germans back towards the
Hindenburg Line, 74th (Y) Division reaching
Ronssoy Wood on 8 September, but III Corps was unable to capture
Épehy on 9 September. A fullscale attack on these strong positions (the
Battle of Épehy) therefore had to be organised, and during the pause 74th (Y) Division suffered many casualties from
Mustard gas. The night-time assembly for the attack was made difficult by rain and gas, but the attack went in at 05.20 on 18 September and the 12th (WSY) Bn leapfrogged through the
16th (Sussex Yeomanry) Battalion, Royal Sussex Regiment to gain the second objective. There followed a couple of days' skirmishing as the division consolidated its positions to prepare for another advance. It was then relieved on the night of 24/25 September. on 10 November 1918. 74th (Y) Division did not return to line until after Fourth Army had broken through the Hindenburg Line at the
Battle of the St Quentin Canal. It joined
XI Corps in
Fifth Army on the night of 1/2 October and began advancing before it had completed its relief of the division in the line. The relief was concluded the next night after a advance to
Hargnies. On 8 October it reverted to III Corps, whose HQ took over the line in this area. On 14 October Fifth Army began pursuing the Germans towards the
River Scheldt, but 229th Bde was kept back from the Haute
Deûle Canal by enemy fire, and had to make an assault crossing on 17 October. Next day the brigade turned German snipers out of
Ascq and then drove the enemy off the
Orchies–
Lannoy railway embankment. Next day the division lost touch with the retreating Germans. On 20 October, with the front narrowing, 229th Bde took over the whole divisional frontage as it approached
Tournai and the Scheldt. Here resistance stiffened, and 21 October it could get no further than the high ground overlooking the city. After several days of patrolling and
raiding, 74th (Y) Division discovered early on the morning of 8 November that the enemy had abandoned their positions and it occupied Tournai, with troops crossing the Scheldt by temporary footbridges. Next day the division put out outposts, but it had lost touch with the enemy. The following day, 11 November, the division crossed the
Dendre Canal and occupied
Ath at 08.30; at 11.00 the
Armistice with Germany came into force, ending hostilities. The troops of 74th (Y) Division were then engaged in repairing the Tournai–
Leuze railway. In December the division moved into winter quarters in the
Lessines area.
Demobilisation proceeded rapidly from February 1919, and the units dwindled away. The remaining
cadre of 12th (WSY) Battalion Somerset LI returned home and was disembodied at Taunton on 20 June 1919. the brigade was numbered as
2nd Mounted Brigade and joined
1st Mounted Division. In about May 1916 it went to
Norfolk with its brigade. In February 1917, the City of London Yeomanry was replaced by
2/1st Hampshire Yeomanry and the unit became
5th (Hampshire and West Somerset) Yeomanry Cyclist Regiment. In March 1917 it resumed its identity as
2/1st West Somerset Yeomanry, still with the 2nd Cyclist Bde, at
Elmham near
East Dereham. It remained in Norfolk until May 1918 when it went to
Ireland with the 2nd Cyclist Bde and was stationed at
Athlone until the end of the war. 2/1st West Somerset Yeomanry was disbanded on 24 November 1919 at
The Curragh.
3/1st West Somerset Yeomanry The 3rd Line regiment was formed in 1915. In the summer it was affiliated to a
Reserve Cavalry Regiment at
Tidworth. In July 1916 it was dismounted and attached to the 3rd Line Groups of the
Wessex Division at
Winchester as its 1st Line was serving as infantry. Disbanded in early 1917 with personnel transferring to the 2nd Line regiment or to the 4th (Reserve) Battalion of the
Somerset Light Infantry at
Bournemouth. ==Between the wars==