A map of the Vimy crest showing the four stages of military objectives in colour: 1st objective in black, 2nd objective in red, 3rd objective in blue and 4th objective in brown.
A map of the Canadian Corps military objectives from the General Staff war diary, April 1917. (The National Archives, WO 95/1049/9)
A map of the Vimy crest showing the four stages of military objectives in colour: 1st objective in black, 2nd objective in red, 3rd objective in blue and 4th objective in brown.