Munition workers in a shell warehouse at National Shell Filling Factory No.6, Chilwell, Nottinghamshire in 1917.
British troops of the 17th Battalion, London Regiment, 47th Division, crossing a muddy area in the Ancre Valley, Somme, October 1916.
Soldiers of 'A' Company, 11th Battalion, the Cheshire Regiment, occupy a captured German trench at Ovillers-la-Boisselle on the Somme.
Troops of the 4th Battalion, Worcestershire Regiment (29th Division) marching to the trenches. Acheux-en-AmiÃÂ©nois, Somme, 27 June 1916.
Wounded men being tended in a trench near Beaumont Hamel on the morning of the initial assault, Battle of the Somme, 1st July 1916.
Australian troops walk along a duckboard track through the remains of Chateau Wood, Third Battle of Ypres (Passchendaele)
British troops advance to the attack through a cloud of poison gas as viewed from the trench which they have just left.
The Scottish Women's Hospital : In The Cloister of the Abbaye at Royaumont. Dr. Frances Ivens inspecting a French patient.
A British Pilot in a BE2C approaching Hit along the course of the River Euphrates, July 1919.
The remains of Thiepval chateau on the Somme battlefield, 28 September 1916.
Men of the Lancashire Fusiliers cleaning a Lewis gun in a trench near Messines in Belgium during January 1917.
The dawn sky is lit by the bombardment before the assault on Thiepval, 15 September 1916, during the Battle of the Somme.
Three 8-inch howitzers of 39th Siege Battery, Royal Garrison Artillery (RGA), firing from the Fricourt-Mametz Valley during the Battle of the Somme, August 1916.
British soldiers eating hot rations in the Ancre Valley during the Battle of the Somme, October 1916.
The mine under German front line positions at Hawthorn Redoubt is fired 10 minutes before the assault at Beaumont Hamel. First day of the Battle of the Somme, 1 July 1916.
A line of British troops blinded by tear gas at an Advanced Dressing Station near Bethune, 10 April 1918.
A Vickers machine gun team wearing PH Type anti-gas helmets in action near Ovillers during the Battle of the Somme, 1916.
A Royal Irish Fusilier at Gallipoli in 1915, attempts to draw the fire of a Turkish sniper to reveal his position.