It took part in the Mesopotamian campaign and was broken up soon after the end of the war.

The third regiment joined from Corps Troops, and its machine gun squadron and other support units were assembled in Mesopotamia.

[1] It did not join the Cavalry Division (Mesopotamia) but served as an independent formation.

[2] The brigade remained in Mesopotamia for the rest of the First World War, taking part in the action of Khan Baghdadi (26–27 Match 1918), the action at Fat-ha Gorge on the Little Zab (23–26 October 1918) and the Battle of Sharqat (28–30 October 1918) under the command of I Corps.

[3] After the Armistice of Mudros, the brigade was not selected to form part of the occupation forces for Mesopotamia.