Fort De Voorn was a sconce built in 1588 by Maurice of Orange on the river island Voorne to control the river. The Spanish were unable to take the fort and constructed Fort St Andries near by. During the Dutch Revolt both forts kept on firing at each other. Fort Voorne was destroyed in 1673 by the French.[7] Fort Nieuw St Andries was built in 1815 to replace the old fort. During World War II, it was used by the Luftwaffe. In 1945, it was blown up to prevent it from falling into allied hands.[8] In 1840, Heerewaarde was home to 511 people.[5]