Answer: Lance Corporal Schofield (George MacKay) are called into their superior’s bunker. The troops at the front line are about to walk into an ambush, they’re told by a fictional General Erinmore (Colin Firth). They plan to go on the offensive and attack the German forces, who appear to be retreating, but it’s a trap. 1,600 lives are at risk and the only way to get news to the operation’s commanding officer is for Blake and Schofield to hand-deliver a letter. They must exit the trenches, cross No-Man’s Land, get through the German encampments and then also a town, and then head down river to the woods where the men are preparing for what they don’t know is a certain slaughter.