Title: The Mannerheim Line, 1920-39
Subjects: Festung, Local History, Russo-Finnish War, 1939-1940, Defenses, Fortification, Military History, Befestigung, Boundaries, Finnisch-sowjetischer Winterkrieg, History, Russo-finnish war, 1939-1940
Places: Karelian Isthmus, Karelian Isthmus (Russia), Karelien, Russia (Federation), Finland, Soviet Union
Time periods: 20th century