Based on real accounts it follows a group of friends from the north of England, mates from the local church, who joined up together to fight for King and country. Walter Fiddes was a shop assistant, Stephen Sharples a builder, and Thomas Mellor a travelling salesman. They would fight - and die - side by side on 1 July 1916, just three of the 20,000 who fell on the first day of the Somme. It was the bloodiest day in British military history.