The regiment sailed for war on 19 October 1914 and arrived in Egypt on 10 December. When the rest of the division departed to take part in the Gallipoli, the light horse were left behind the authorities under the belief that mounted troops would not be needed in the campaign due to the terrain. However, infantry casualties were so severe it was decided to send them, without their horses, as infantry reinforcements. The regiment landed at what became known as ANZAC Cove between the 22 and 24 May 1915. Initially, the regiment was broken up and provided squadrons as reinforcements for infantry battalions at various points around the beachhead, and it was not until 11 June that the regiment concentrated as a formed unit. After this, they were mostly used to defend the Allies' precarious position on the peninsula, especially in the area of "Ryrie's Post", although they did take part in several small assaults. The regiment left Gallipoli prior to the end of the campaign on 11 December 1915.