World War, 1914-1918 189 History 40 Campaigns 37 Regimental histories 20 Soldiers 11 Literature and the war 10 Causes 7 more ... Diplomatic history 7 Social aspects 7 Generals 6 Foreign relations 5 Historiography 5 History and criticism 5 History, Military 5 Influence 5 Medical care 5 Aerial operations, British 4 Monuments 4 Naval operations 4 Participation, Australian 4 Peace 4 Somme, 1st Battle of the, France, 1916 4 Veterans 4 Young men 4 Advertising 3 Argonne, Battle of the, France, 1918 3 Children of the rich 3 College students 3 Memory 3 Motion pictures and the war 3 less ...