When the First World War broke out, the Post Office was the biggest employer in the world, with its own company of volunteer part-time soldiers, The Post Office Rifles. Suddenly catapulted into conflict, ordinary postmen and messenger boys found themselves in the trenches of the Western Front, hoping that their own letters would reach home - and relying on the letters and parcels they received for comfort and much-needed boosts to morale. By the war's end, 1,500 of them had been killed. Using the personal stories, letters and diary entries of the men who joined the Post Office Rifles, this is a moving account of how the war touched the lives of ordinary people - how it changed communities, how women took up men's work, and, of course, the vital role the mail played in winning the war.