On 11 April 1915, the regiment embarked on the "Scotia" and departed from Avonmouth Docks for the Mediterranean. It arrived off Cape Helles on 28 April, three days after the Allied landing had begun the Gallipoli Campaign, and it stood by to land, watching the naval bombardment and shrapnel bursting. However, on 1 May it departed again for Egypt, arriving at Alexandria on 6 May, where it rejoined the 2nd Mounted Division. It was posted to the Suez Canal Defences (near Ismaïlia) by the middle of May and its parent brigade was designated 4th (London) Mounted Brigade. The division was dismounted in August 1915 for service at Gallipoli. Each regiment left a squadron headquarters and two troops (about 100 officers and men) in Egypt to look after the horses.