In 1914, shortly after WWI had begun, 100,000 British and German troops were involved in an extraordinary ceasefire which lasted from Christmas Eve until Boxing Day: the Christmas truce. Corporal Walter Sinclair Smith was killed during the Christmas truce when he was caught by sniping from enemy lines. In the episode, his great-niece Lynn Miles learns fascinating – and shocking – new information about Walter's death. Andy Simm is the great-grandson of lance corporal George Ashurst who served with the Lancashire Fusiliers during WWI. Ashurst was one of the main witnesses of the Christmas truce. During the episode, Andy hears an audio recording of his great-grandfather's first-hand account of the event. Carolann Smith-Dorrien's grandfather is General Sir Horace Smith-Dorrien, one of the most senior commanders of the British expeditionary forces at the time of the truce. Carolann discovers how big a part her grandfather played in ending the truce.