There are quite a few artillery pieces on display at the Imperial War Museum Duxford in their Land Warfare exhibit.
This is a German 7.7cm Field Gun from World War One.
The gun on the right is a British 18 pounder quick firing field gun. The one on the left an American M1917 75mm field gun, based on the British 18 pounder.
This is a German 21cm Heavy Howitzer or Mortar.
The 21 cm Mörser 10 (21 cm Mrs 10) was a heavy howitzer used by Germany in World War I (although classified as a mortar (Mörser) by the German military).
As well as the guns there was also a trench train. Well a British MM15 War Department Light Railways Motor Rail 40hp ‘Simplex’ Petrol Tractor to be precise.
For use on the two foot War Department Light Railway.
The War Department Light Railways were a system of narrow gauge trench railways run by the British War Department in World War I. Light railways made an important contribution to the Allied war effort in the First World War, and were used for the supply of ammunition and stores, the transport of troops and the evacuation of the wounded.