New Castle Hundred in New Castle County, Delaware — The American Northeast (Mid-Atlantic)

Fort Casimir: Key to the Early Delaware Valley

Photographed by Devry Becker Jones (CC0), March 1, 2019

1. Fort Casimir: Key to the Early Delaware Valley Marker

Inscription. In the mid-1600s this site was the focal point of a three-nation struggle for control of the Delaware River. Dutch military leaders recognized the strategic importance of this place in controlling river traffic in 1651 and established a fort here. Swedish settlers from Fort Christina (now Wilmington) responded by seizing the fort in 1654 and renaming it Fort Trefaldighet (Fort Trinity). A year later, Peter Stuyvesant, the governor of New Netherland, force the surrender of the fort to the Dutch. The fort remained in Dutch hands until the English assaulted and captured it in 1664. Its capture assured English control of the Delaware Valley.

(Caption)
Archaeologists working on this site found remains of the fort's defensive works. They also found what may be a grenade or cannon ball.

Erected by New Castle Community Partnership.

Topics. This historical marker is listed in these topic lists: Colonial Era • Forts and Castles • Settlements & Settlers. A significant historical year for this entry is 1651.

Location. 39° 39.728′ N, 75° 33.561′ W. Marker is in New Castle, Delaware, in New Castle County. It is in New

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Castle Hundred. It is on East Second Street east of Chestnut Street, on the right when traveling east. Touch for map. Marker is at or near this postal address: 207 East Second Street, New Castle DE 19720, United States of America. Touch for directions.

Regionally, this marker is in Greater Wilmington and in Greater Philadelphia.

It is also in the American Mid-Atlantic

and on the Delmarva Peninsula.

Globally, it is in the North Atlantic Region,

North America,

the Western Hemisphere,

the Western World,

and the Anglosphere.

Historically, it finds itself in what was once New Netherland

and also one of the original Thirteen Colonies.

Other nearby markers. At least 8 other markers are within walking distance of this marker: Site of Fort Casimir (within shouting distance of this marker); Fort Casimir (within shouting distance of this marker); Broad Dyke (about 600 feet away, measured in a direct line); Veterans Memorial (about 600 feet away); Mount Salem U.M. Church (approx. 0.2 miles away); Midshipman John Stockton, United States Navy (approx. 0.2 miles away); George Read (approx. 0.2 miles away); Revolutionary War Patriots in the Immanuel Churchyard

Photographed by Devry Becker Jones (CC0), March 1, 2019

2. Fort Casimir: Key to the Early Delaware Valley Marker

(approx. 0.2 miles away). Touch for a list and map of all markers in New Castle.

Credits. This page was last revised on May 28, 2026. It was originally submitted on March 1, 2019, by Devry Becker Jones of Washington, District of Columbia. This page has been viewed 915 times since then and 71 times this year. Photos: 1, 2. submitted on March 1, 2019, by Devry Becker Jones of Washington, District of Columbia. • Bill Pfingsten was the editor who published this page.