Engraved shell-cases, bullet-crucifixes, letter openers and cigarette lighters made of shrapnel and cartridges, miniature airplanes and tanks, talismanic jewelry, embroidery, objects carved from stone, bone and wood - all of these things are trench art, the misleading name given to the dazzling array of objects made from the waste of war, in particular the Great War of 1914-1918 and the inter-war years. And they are the subject of Nicholas Saunders's pioneering study which is now republished in a revised edition in paperback. He reveals the lost world of trench art, for every piece relates to...