The guns of the Royal Garrison Artillery

The 6-inch, 26-hundredweight howitzer. Used by Siege Batteries from late 1915 onwards. Towed by horse team or 3-ton 4WD lorry. Maximum effective range 8,700m.

Imperial War Museum photo Q10595, “Gunners of the Royal Garrison Artillery firing a 6-inch 26 cwt howitzer on the Cambrai front, 21 December 1917. Note snow-covered camouflage netting.”

The 8-inch howitzer (Mk VI and later). Used by Siege Batteries from summer 1916 onwards. Maximum effective range 9,825m; later Marks 11,200m.

Imperial War Museum photo Q2233, “British troops moving an 8-inch Mk V howitzer into position, Bécordel-Bécourt, 26 May 1917.”

The 12-inch road-mounted howitzer. In use from mid-1916 onwards. Maximum effective range 10,370m (later versions 13,120m.)

Imperial War Museum photo Q7808, “A camouflage-painted 12-inch howitzer of the 104th Siege Battery, RGA, in front of Zillebeke. 24 September 1917.”

The 12-inch railway-mounted howitzer. In use from late 1915 onwards. Maximum effective range 29,900m.

Imperial War Museum photo Q1433, “A Royal Artillery 12-inch railway gun in action at Maricourt, October 1916. In the foreground, a group of watching French soldiers cover their ears against the blast.”

The 60-pounder field gun. In use from the start of the war. Effective range varied as various Marks were developed, but was typically 11,200m. Imperial War Museum photo Q8718, “60-pounder gun of the 48th Heavy Battery, Royal Garrison Artillery in action in the open near Strazeele, at full recoil, 15 April 1918. The officer on the right is Colonel Charles Fosbett Phipps DSO, probably the CO of the battery.”