books.google.ca - Vimy Ridge was one of the most important geographic features on the entire Western Front in World War I. In early 1917 it was considered practically impregnable, but on 9 April the Canadian Army Corps, under the command of the British Lieutenant General Sir Julian Byng, assaulted it as part of the Arras...http://books.google.ca/books/about/Vimy_Ridge_1917.html?id=V-yWVYKX8zcC&utm_source=gb-gplus-shareVimy Ridge 1917
