For many in Britain, the resulting battle remains the most painful and infamous episode of the First World War.
Pictures copyright Press Association

25. A British Grenadier Guardsman keeps watch on 'No-Man's land' as his comrades sleep in a captured German trench at Ovillers, near Albert, during the Battle of the Somme in 1916.
A British Grenadier Guardsman keeps watch on 'No-Man's land' as his comrades sleep in a captured German trench at Ovillers, near Albert, during the Battle of the Somme in 1916.:- Photo: PA

26. British troops, flanked by two French Poilu's, with captured German guns, at a French base.
British troops, flanked by two French Poilu's, with captured German guns, at a French base.:- Photo: PA Photos:PA

27. A British artilleryman pulling the Lanyard to fire an 8 inch Howitzer during the massive and bloody Battle of the Somme in France.
A British artilleryman pulling the Lanyard to fire an 8 inch Howitzer during the massive and bloody Battle of the Somme in France.:- Photo: PA

28. Civilians and soldiers of the Royal Army Medical Corps distributing refreshments to British wounded in France.
Civilians and soldiers of the Royal Army Medical Corps distributing refreshments to British wounded in France.:- Photo: PA
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