Discover facts about the Battle of the Somme and see how the site has changed since 1916 with footage from The Battle of the Somme film overlaid with shots of the same locations 100 years on in a poignant reminder of the impact of war. | Imperial War Museum London

After 141 days and over a million casualties, the Battle of the Somme came to a close on 18 November 1916. But why did the battle happen in the first place? | Imperial War Museum London