part of the 2nd South Western Mounted Brigade. It mobilised on 4 August 1914 and, with its brigade, moved to the Colchester area. It was dismounted in September 1915. Gallipoli 1915 Still with the 2nd South Western Mounted Brigade, in September 1915 the regiment left Colchester for Liverpool. On 24 September it boarded RMS Olympic and sailed the next day. It arrived at Mudros on 1 October and on to Suvla Bay. The regiment landed in Gallipoli on 9 October and was attached to the 11th (Northern) Division (digging trenches). In November it was in the firing line, attached to the 2nd Mounted Division and 53rd (Welsh) Infantry Division. On 19 December it was evacuated to Imbros. The diary of Lt.Col. Robert Arthur Sanders (1867–1940) (Baron Bayford from 1929) of the Royal North Devon Yeomanry (and Master of the Devon and Somerset Staghounds 1895-1907) survives in the National Army Museum covering the Gallipoli Campaign. Casualties of the regiment included: Major Morland Greig (1864-1915), of Edgcott, Exford, Somerset, then Master of the Devon and Somerset Staghounds Captain John Oliver Clemson (1882-1915) of Stevenstone, St Giles in the Wood. Egypt 1916–17 On 30 December 1915, the regiment landed in Alexandria to help defend Egypt. In February 1916, 2nd South Western Mounted Brigade was absorbed into the 2nd Dismounted Brigade (along with elements of the Highland and Lowland Mounted Brigades). It served on Suez Canal defences and part of the Western Frontier Force. On 4 January 1917, the regiment was amalgamated with the 1/1st Royal 1st Devon Yeomanry at Moascar, Egypt to form the 16th (Royal 1st Devon and Royal North Devon Yeomanry) Battalion, Devonshire Regiment and 2nd Dismounted Brigade became 229th Brigade in the 74th (Yeomanry) Division. Palestine 1917–18 With the 74th Division, it took part in the invasion of Palestine in 1917 and 1918. It fought in the Second and Third Battles of Gaza (including the capture of Beersheba and the Sheria Position). At the end of 1917, it took part in the capture and defence of Jerusalem and in March 1918 in the Battle of Tell 'Asur. On 3 April 1918, the Division was warned that it would move to France and by 30 April 1918 had completed embarkation at Alexandria. France and Flanders 1918 On 7 May 1918, 16th (Royal 1st Devon and Royal North Devon Yeomanry) Battalion, Devonshire Regiment landed at Marseilles, France with 74th (Yeomanry) Division. It