World War, 1914-1918 192 History 45 Campaigns 38 Regimental histories 21 Literature and the war 12 Soldiers 11 Generals 8 more ... Diplomatic history 7 Causes 6 Social aspects 6 Foreign relations 5 History and criticism 5 History, Military 5 Influence 5 Medical care 5 Aerial operations, British 4 Historiography 4 Monuments 4 Naval operations 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 Criticism and interpretation 3 Memory 3 Military leadership 3 less ...