It continued as a distinct branch of the Royal Garrison Artillery until World War I.

[1][2] There were also a number of mountain batteries in India officered by the RA, but these were on the establishments of the Indian Armies.

[4] Mountain Division, RA, comprised the following batteries:[2][4][5][6] In 1899 the Royal Artillery was divided into two distinct branches, field and garrison.

[6] With the formation of the part-time Territorial Force (TF) in 1908 the 1st Argyll & Bute RGA (Volunteers) was converted into 4th Highland (Mountain) Brigade, Royal Garrison Artillery, attached to the Highland Division as the TF's only mountain artillery unit.

[6][9] Postwar, the RGA adopted the regiment-sized 'brigades' employed by the RHA and RFA and the mountain batteries were organised into a number of 'Pack Brigades'.