It comes as part of a set of stamps marking the centenary of each year of the First World War.
Private Lemuel Thomas Rees was hit by an exploding German shell during the Battle of Passchendaele. A small Bible that he kept in his breast pocket saved his life.
After spending four months in a field hospital, he was sent home on leave where he suffered terrible nightmares, reliving the horrors of trench warfare.
Following his return to the Western Front, Rees was wounded in a gas attack and died from bronchial pneumonia and the effects of gas on 13th November 1918, only two days after the Armistice was signed.
Philip Parker from the Royal Mail commented: “The First World War claimed millions of lives, changed the course of history and transformed the futures of the generations that followed. We are proud to present the fourth part of our commemorative programme marking the contribution and sacrifice of those who took part.”