The regiment landed at Suvla Bay on the morning of 18 August and moved into reserve positions at Karakol Dagh. It moved to "C" Beach, Lala Baba on 20 August. On 21 August it advanced to Chocolate Hill under heavy fire and took part in the attack on Hill 112. Due to losses during the Battle of Scimitar Hill and wastage during August 1915, the 2nd Mounted Division had to be reorganised. On 4 September 1915, the 2nd Composite Mounted Brigade was formed from the 3rd (Notts and Derby) and 4th (London) Mounted Brigades. The regiment formed part of a battalion sized unit "4th London Regiment". The regiment embarked for Mudros on 2 November and, in December 1915, returned to Egypt, where it was reformed and remounted.