Region of France made (in)famous by World War 1).
Also common title for the First Battle of the Somme. This is probably best known for the first day of the first battle - 1 July 1916 when there were over 50,000 British and Empire casualties. Sometimes known as the British Army's blackest day.
This wiki page has a fuller account of the First Battle of the Somme in 1916.
This wiki page features the Second Battle of the Somme in 1918.