military operation, operation - activity by a military or naval force (as a maneuver or campaign); "it was a joint operation of the navy and air force"

battle of St Mihiel, Saint-Mihiel, St Mihiel - a battle in the Meuse-Argonne operation in World War I (1918); the battle in which American troops launched their first offensive in France

First World War, Great War, War to End War, World War 1, World War I - a war between the allies (Russia, France, British Empire, Italy, United States, Japan, Rumania, Serbia, Belgium, Greece, Portugal, Montenegro) and the central powers (Germany, Austria-Hungary, Turkey, Bulgaria) from 1914 to 1918

France, French Republic - a republic in western Europe; the largest country wholly in Europe