The story of the bloody 1917 Battle of Vimy Ridge is, according to many of today's tellings, a heroic founding moment for Canada. This noble, birth-of-a-nation narrative is regularly applied to the Great War in general. Yet this mythical tale is rather new. «Vimyism»-today's official story of glorious, martial patriotism-contrasts sharply with the complex ways in which veterans, artists,…