February 1915 it was transferred to 1/1st Eastern Mounted Brigade (this time replacing 2nd King Edward's Horse which had left for the Canadian Cavalry Brigade) in the Woodbridge area, still in 1st Mounted Division. In September 1915, the regiment was dismounted and left Suffolk for Liverpool. On 24 September it boarded RMS Olympic and sailed the next day. It arrived at Mudros on 1 October and on 10 October it landed at Anzac Cove in Gallipoli. Along with its brigade, it was attached to the 54th (East Anglian) Division; the regiment was attached to 163rd Brigade, carrying out mining operations at Hill 60. Between 15 and 20 December, the regiment was evacuated to Mudros. After the evacuation from Gallipoli, it moved to Egypt in December 1915 and on 22 February 1916 the Eastern and South Eastern Mounted Brigades were amalgamated into the 3rd Dismounted Brigade. It served as part of the Suez Canal Defences from 14 March to 26 July attached to 42nd (East Lancashire) Division; it then joined the Western Frontier Force. By the end of the year, it was back on the Suez. 25th (Montgomery & Welsh Horse Yeomanry) Bn, Royal Welch Fusiliers On 14 January 1917, Egyptian Expeditionary Force (EEF) Order No. 26 instructed that the 2nd, 3rd and 4th Dismounted Brigades be reorganized as the 229th, 230th and 231st Brigades. Consequently, on 4 March 1917, the regiment was amalgamated with the 1/1st Montgomeryshire Yeomanry as the 25th (Montgomery and Welsh Horse Yeomanry) Battalion, Royal Welch Fusiliers at Helmieh, Cairo. It joined 231st Brigade in the 74th (Yeomanry) Division. Lieutenant-Colonel Lord Kensington, CMG, DSO, a former officer in the 15th Hussars, who had been commanding the Welsh Horse Yeomanry, became commanding officer or the new battalion. With 74th Division, the battalion took part in the invasion of Palestine in 1917 and 1918. Shortly after joining the division it took part in the Second Battle of Gaza (17–19 April 1917). Then in the autumn it fought in the Third Battle of Gaza (27 October–7 November). Shortly afterwards it was involved in the Capture of Jerusalem (8–9 December) and its subsequent defence (27–30 December). In March 1918, the battalion participated in the Battle of Tel 'Asur, but shortly afterwards was warned that it was to move to France, where reinforcements were urgently required to stem the German spring offensive. In May 1918, the Division moved to France, and the