Fort Constitution Historic Site, New Hampshire

Fort Constitution was one of seven forts that once constituted the defenses of Portsmouth Harbor. The first fortification on the site was an earthwork with four “great guns” erected in 1632. A timber blockhouse was built in 1666. A stronger fort, named Fort William and Mary, was erected later as one of the “castles” established along the Atlantic coastal to protect the colonies of British America. This fort was seized by Patriots at the beginning of the American Revolution. In 1791 the State of New Hampshire gave Fort William and Mary to the United States. The fort was repaired, renamed Fort Constitution, and garrisoned with a company of United States artillery. The fort was used during the War of 1812 and was a training center during the Civil War. The old fort was replaced after the Civil War with a massive, three-tiered granite structure that served as part of the modernized coastal defenses in the late nineteenth and early twentieth centuries. Fort Constitution State Historic Site is located on a peninsula at the northeast corner of New Castle Island, overlooking both the Pisquatua River and the Atlantic Ocean.

Fort Constitution Historic Site is located on New Hampshire Route 1B at the U.S. Coast Guard Station, New Castle.

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