Vimy Ridge 1914-18 - Battle Book #26, Ballantine's Illustrated History Of The Violent Century

From the back cover: Territorially the Allies had gained but one feature of lasting value- Vimy Ridge. The cost to them was some 250,000 casualties: to the Germans about 210,000. All, except the taking of the Ridge, would soon be forgotten in the whirlwind of intensified war that would follow.