On 6 April 1917, aerial reconnaissance has observed that the German army, which has pulled back from a sector of the Western Front in northern France, is not in retreat but has made a strategic withdrawal to the new Hindenburg Line, where they are waiting to overwhelm the British with artillery. In the British trenches, with field telephone lines cut, two young British lance corporals, William Schofield, a veteran of the Somme, and Tom Blake, are ordered by General Erinmore to carry a message to Colonel Mackenzie of the Second Battalion of the Devonshire Regiment, calling off a scheduled attack the next morning that would jeopardise the lives of 1,600 men, including Blake’s brother Joseph, a lieutenant.
Schofield and Blake cross no man’s land to reach the abandoned German trenches, passing a ditched British Mark II tank, but Schofield injures his left hand along the way. In an underground barracks, they discover a tripwire set by the Germans, which is promptly triggered by a rat; the explosion almost kills Schofield, but Blake saves him, and the two escape. They arrive at an abandoned farmhouse, where a German plane is shot down in a dogfight with Allied aircraft. Schofield and Blake save the burned pilot, but the pilot stabs Blake and is shot dead by Schofield. Schofield comforts Blake as he dies, promising to complete the mission and to write to Blake’s mother. Taking Blake’s rings and dog tag, as well as Erinmore’s letter, he is picked up by a passing British unit.
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