Crisis at the battle of Verdun 23 June 1916. The solid blue line shows the French line before the attack. The dashed line shows the furthest extent of the German advance and the blue crosses the positions restored by the French by 2nd July

Map showing the battle of Verdun 23 June 1916. The solid blue line shows the French line before the attack. The dashed line shows the furthest extent of the German advance and the blue crosses the positions restored by the French by 2nd July