Initially acting in an independent role, the brigade took part in the Battle of Shaiba (12–14 April 1915) where Major George Wheeler of the 7th Hariana Lancers won the Victoria Cross, and Operations in Persian Arabistan (21 April–18 June) including the Affair of Khafajiya (14–16 May). It then took part in the Battle of Es Sinn (28 September) that resulted in the capture of Kut al Amara. From 6 October, the brigade was placed under the command of the 6th (Poona) Division and with it took part in the advance on Baghdad including the Battle of Ctesiphon (22–24 November) and the subsequent withdrawal (the Affair of Umm at Tabul on 1 December) back to Kut. It left the division there on 6 December before it got besieged.