5/5 1918. As peace terms are negotiated, Tommy and Michael are still on the front line.
4/5 1917. Michael is taken prisoner, and Joanna has some big news for Tommy.
3/5 Tommy and Michael's regiments face one another on opposite sides of the Somme battlefield.
2/5 Michael makes a terrible choice, while Tommy's regiment experiments with a new weapon.
1/5 At the outbreak of war, two teenage boys defy their parents to sign up.