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.
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 Royal Irish Fusilier at Gallipoli in 1915, attempts to draw the fire of a Turkish sniper to reveal his position.
Tank F4, 'Flirt II', at the Tank Driving School at Wailly on 21 October 1917, in training for the Battle of Cambrai.
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.
The Battle of Pilckem Ridge: Crossing the Yser Canal at Boesinghe, 31st July 1917.
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.
Aerial photograph showing the opposing trench systems between Loos and Hulluch in July 1917.
British troops of the 17th Battalion, London Regiment, 47th Division, crossing a muddy area in the Ancre Valley, Somme, October 1916.
Icicles hanging from the roof of a dug-out Bernafay Wood, Somme, November 1916.
Soldiers of the Lancashire Fusiliers cleaning a Lewis Gun. On the left can be seen the gas alarm horn and wind vane. January 1917 near Ploegsteert.
A sergeant of the Lancashire Fusiliers in a flooded dugout opposite Messines near Ploegsteert Wood, January 1917.
Australian troops wait behind Quinn's Post, Gallipoli, after it was retaken on 29 May 1915.
A shell bursting amongst the barbed wire entanglements on the battlefield at Beaumont Hamel, December 1916.
Men of The Sherwood Foresters marching along the Amiens-St. QuentinRoad, near Brie, March 1917.
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.