Fort Nya Elfsborg, 17th century Swedish colonial fort in Elsinboro, United States.
Fort Nya Elfsborg was a 17th-century Swedish colonial fort built on the eastern bank of the Delaware River, in what is now New Jersey. It was made of earthen walls and wooden palisades, with cannons facing the river to control passing ships.
Governor Johan Printz ordered the fort built in 1643 to secure trade along the Delaware and push back against Dutch expansion. The Swedes abandoned it within a few years, as the site proved difficult to defend and hard to live in.
This fort served as a Swedish trading stronghold with military design that reflected the colonial settlers' Nordic heritage. The structure represented how Swedish colonists adapted their building traditions to this new landscape.
The original fort is now submerged near Elsinboro Point, so there are no visible remains to walk through or explore. A black commemorative monument near Elsinboro Township School marks the site and gives context to the visit.
The soldiers stationed here called it 'Mosquito Fort' because the marshy ground brought swarms of insects that left them with painful swelling. The name stuck and appears in several colonial records from the period.
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