Fort Erfprins is a former fortress of the Defence Line of Den Helder, it is the largest fortress in the Netherlands.
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Fort Erfprins is a former fortress of the Defence Line of Den Helder, it is the largest fortress in the Netherlands.
Fort Erfprins is a former fortress of the Defence Line of Den Helder, it is the largest fortress in the Netherlands. The construction of the Defence Line of Den Helder began in 1807 and was accelerated by Napoleon.Middelkoop/Aerophoto-Schiphol