Common articles that this includes are decorated shell and bullet casings and items carved from wood and bone. Not limited to the World Wars, the history of trench art spans conflicts from the Napoleonic Wars to the present day. Although the practice flourished during World War I, the term 'trench art' is also used to describe souvenirs manufactured by service personnel during World War II. Some items manufactured soldiers, prisoners of war or civilians during earlier conflicts have been retrospectively described as trench art.