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Fort Casimir

1651 · 17th century · Also known as New Amstel

Fort Casimir was a Dutch fort built in 1651 on the Delaware River by Peter Stuyvesant to challenge the colony of New Sweden. The Swedes seized it in 1654 and renamed it Fort Trinity, prompting the Dutch to conquer all of New Sweden in 1655. Renamed New Amstel, it later passed to the English and became the town of New Castle, Delaware.

Fort Casimir
Image: Dedden 11:31, 30 April 2006 (UTC) · Public domain · Wikimedia Commons

Mentioned in 2 state histories

New SwedenDelaware Colony

See also

Cite this entry
APA
The Epoch Institute. (2026). Fort Casimir. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/fort-casimir
MLA
“Fort Casimir.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/fort-casimir. Accessed .
Chicago
The Epoch Institute. “Fort Casimir.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/fort-casimir.
Harvard
The Epoch Institute (2026) ‘Fort Casimir’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/fort-casimir (Accessed: ).

Last reviewed October 2026Random entry ↻