The Battle of Arras was an Allied (British, Canadian, Australian, New Zealand and Newfoundland) offensive against the German army, from 9 April to 16 May 1917, that led to the recapture by the Allies of several important strategic points, notably Vimy Ridge.
It was a fierce battle, with much shelling, artillery fire and dogfights that cost the lives of some 158,660 Allied soldiers and an estimated 120,000 to 130,000 German soldiers.