At the height of the First World War during Spring 1917 in northern France, two young British soldiers, Schofield (George MacKay) and Blake (Dean-Charles Chapman), are given a seemingly impossible mission to deliver a message which will warn of an ambush during one of the skirmishes soon after the German retreat to the Hindenburg Line during Operation Alberich.[3] The two recruits race against time, crossing enemy territory to deliver the warning and keep a British battalion of 1,600 men, which includes Blake's own brother, from walking into a deadly trap.[4] The pair must give their all to accomplish their mission by surviving the war to end all wars.[5]