The Battle of the Somme was one of the most significant campaigns of World War One, as the Allied forces attempted to break through the German front line in northern France, 1916.
This interactive map shows the victories, defeats and painful stalemate, and how the lessons learned paved the way for victory on the Western Front in 1918.
View a non-Flash version.
Consultant and Text: Richard Holmes
Based on an original idea by the bbc.co.uk/history team
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