Columbia subject headings:
Fortification--France--Montreuil (Pas-de-Calais)
Military architecture--France--Montreuil (Pas-de-Calais)
Montreuil (Pas-de-Calais, France)--History.
Harvard subject headings:
Princeton subject headings:
Fortification--France--Montreuil (Pas-de-Calais)--History.
Military architecture--France--Montreuil (Pas-de-Calais)--History.
Montreuil (Pas-de-Calais, France)--History.