The depots and training units of the Royal Garrison Artillery
Imperial War Museum photograph Q54222, “Officer Cadets at the physical training drill at No. 1 RGA Officer Cadet School at Trowbridge, November 1917.”
The Garrison Companies of the RGA
Artists impression of a modern coastal battery. From the “Illustrated War News” of Wednesday 28 October 1914.
Allocations of Siege Batteries to higher commands
Imperial War Museum photograph Q2265, “An 8-inch Mk V howitzer of 135th Siege Battery RGA, in action near Hénin-sur-Cojeul, 27 May 1917.”
Allocations of Heavy Batteries to higher commands
Imperial War Museum photograph Q918, “4.7-inch gun of the 1/1st London Heavy Battery RGA in Sausage Valley, Bécourt Wood, September 1916.”
The Mountain Batteries of the Royal Garrison Artillery
Imperial War Museum photograph Q31711, “Men of a Royal Garrison Artillery mountain battery dragging their 2.75-inch mountain gun along a track in the Krusha Balkan Hills, 1916.”
Imperial War Museum photograph Q4922, “British 9.45-inch Heavy Trench Mortar and its crew in an old German trench in Pigeon Wood. It is snowing, and one of the men has placed a cover over the end of the barrel to protect it from the weather. Gommecourt, March 1917.”
Anti-Aircraft Batteries and Sections
Imperial War Museum photograph HU108149, “Lorry mounted 13-pounder anti-aircraft gun of No.11 Anti-Aircraft Section, Royal Garrison Artillery, ready for action, 1915.”
The RGA units providing coastal defence at home were reorganised into a new structure in 1918