Ernest H like Erwin Rommel??  Italy..............and WW1................there are usually several ways.........clues.................to ensure that u can find the code................

During the First World War, Ernest Hemingway volunteered to serve in Italy as an ambulance driver with the American Red Cross. In June 1918, while running a mobile canteen dispensing chocolate and cigarettes for soldiers, he was wounded by Austrian mortar fire.Nov 2, 2017

Hemingway on War and Its Aftermath | National Archives

https://www.archives.gov/publications/prologue/2006/spring/hemingway.html