The remains of Thiepval chateau on the Somme battlefield, 28 September 1916.
Men of Royal Irish Rifles resting in a communication during the opening hours of the Battle of the Somme, 1 July 1916.
Men of the Lancashire Fusiliers cleaning a Lewis gun in a trench near Messines in Belgium during January 1917.
A team of stretcher bearers struggle through deep mud to carry a wounded man to safety near Boesinghe on 1 August 1917 during the Third Battle of Ypres.
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.
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.
Men of 137th Brigade, 46th Division, are addressed by Brigadier General J C Campbell VC CMG DSO on the Riqueval Bridge after breaking the German's Hindenburg Line defences on 29 September 1918.
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.
Officers of 1/7th Battalion, King's Liverpool Regiment checking a map in trenches of the La Bassee Canal sector, 28 February 1918.
A raiding party from the 9th Battalion, Scottish Rifles (Cameronians), leaving a sap and making for the German lines, 11 April 1917.
Two men of the 12th East Yorkshires wearing snow suits leaving their snow-covered trench on daylight patrol. Arleux Sector, 9 January 1918.
Wounded British soldier showing shrapnel damage to his steel helmet caused near Hamel on the Somme Front in December 1916.
Men of the Wiltshire Regiment advancing to the attack through the wire, Thiepval, Somme, 7 August 1916.
A pack horse loaded with rubber trench boots (waiders) is led through the mud near Beaumont Hamel on the Somme battlefield, November 1916.
An Australian carrying his wounded mate to a medical aid post for treatment, Gallipoli, 1915.
The remains of the village of Beaumont Hamel after its capture, The Battle of Ancre Heights 10 -11 November. 1916
The road to Guillemont viewed from Waterlot Farm, 1916. In the words of the official history it was 'straight, desolate, and swept by fire.'
A Sergeant of a Royal Engineers signals section puts a message into the cylinder attached to the collar of a messenger dog, Etaples, 28 August 1918.
Tank F4, 'Flirt II', at the Tank Driving School at Wailly on 21 October 1917, in training for the Battle of Cambrai.
Munition workers in a shell warehouse at National Shell Filling Factory No.6, Chilwell, Nottinghamshire in 1917.
Still from the British film "The Battle of the Somme".
A wounded First World War soldier with facial injuries has a plaster cast made of his face so that a mask can be produced to cover his wounds.The work was undertaken at the 3rd General Hospital in Wandsworth, London.
