Fort Delaware, Military fortress on Pea Patch Island, Delaware River, United States.
Fort Delaware is a military fortress on Pea Patch Island in the Delaware River with over six acres of thick granite walls and a drawbridge across the moat. The five-sided structure contains casemates on two levels, artillery positions, and a walled courtyard.
Construction began in 1848 after Congress allocated funds to strengthen coastal defense along the Atlantic shore. During the Civil War, the structure was converted into a prison camp and held over 12,000 Confederate soldiers at its peak.
The casemates inside show daily life of soldiers and guards, while restored rooms give a sense of prison routines. Visitors can see the heavy cannon and gun ports that once controlled the river entrance.
A ferry from the mainland brings visitors to the island, operating from spring through fall in fair weather. Guided tours explain the rooms and military functions, and sturdy shoes are recommended due to uneven surfaces.
The bakery processed large amounts of flour daily to feed thousands of imprisoned soldiers housed in tight quarters. Water supply came from a deep well in the courtyard that is still visible today.
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