This diary details Samuel P. Fay's travel to France and time in Paris with the American Ambulance Hospital, including his trans-Atlantic voyage, anecdotes related to purported German atrocities (such as the bayoneting of Belgian babies), general impressions of wartime Paris, and diversions when not on duty (such as dining out or attending shows at the Opéra-Comique.)  Fay also recorded his experiences at the American Ambulance Hospital in Neuilly-sur-Seine, including living conditions, retrieving wounded at La Chapelle (the freight area of the Gare du Nord train station in Paris), transporting patients to local hospitals and convalescent facilities outside Paris, impressions of the wounded, and details of medical treatments and operations.