World War, 1914-1918 Guerre mondiale, 1914-1918 15 Chemical Warfare 3 Chemical warfare 3 Conscientious objectors 3 Gases, Asphyxiating and poisonous 3 Gaz de combat 3 more ... Guerre chimique 3 Objecteurs de conscience 3 War use 3 Armed Forces 2 Campagnes et batailles 2 Campaigns 2 History 2 Military campaigns 2 Weltkrieg 2 1940 1 89.32 forms of government 1 Aerial operations, American 1 Aeronautics, Military 1 Aéronautique militaire 1 American 1 Anciens combattants 1 Armed Conflicts 1 Armes de guerre 1 Armies 1 Associations 1 David R. Godine, Publisher 1 Defenses 1 Défense nationale 1 less ...