堑壕战
Trench warfare prevailed on the Western Front from September 1914 until March 1918. Famous battles in France include Battle of Verdun (spanning 10 months from 21 February to 18 December 1916), Battle of the Somme (1 July to 18 November 1916), and five separate conflicts called the Battle of Ypres (from 1914 to 1918).