In the spring of 1918 the BEF came under attack both in Flanders and on the Somme during the German Spring Offensive. The Second Battle of the Somme represented the BEF response to the German attack. This in turn began the Hundred Days Offensive, which led to the eventual defeat of the German Army on the western front, after the First and Third armies broke through the Hindenburg Line at the Battle of the Canal du Nord. This led to the final battle of the war in November 1918, the Battle of the Sambre by the First, Third and Fourth Armies and to the capture of Mons, 11 November 1918, by the First Army.