In February 1917 the Battle of Boom Ravine was fought on the Somme. We tell the story of this awful single day battle through the eyes of the soldiers who were there. What did they see? How did the sudden change in the weather prove disastrous? Was the battle plan given away by British deserters? And the story of the German man whose life was saved by a Tommy and they became friends after the war. What about the German mother who discovered her son had died by the return of his watch from another Tommy?