Title: The Forts and Fortifications of Europe, 1815-1945
Subjects: Fortification, Fortification / Belgium / History / 19th century, Befestigung, Fortification / Netherlands / History / 20th century, Fortification / Switzerland / History / 20th century, Military History, Fortification / Netherlands / History / 19th century, Fortification / Belgium / History / 20th century, History, Fortification / Switzerland / History / 19th century, Switzerland, history, Belgium, history, Netherlands, history
Places: Switzerland, Belgium, Netherlands, Military Netherlands / History, Military Belgium / History, Military Switzerland / History
Time periods: 20th century, 19th century