Military
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Fort Mifflin was laid out in 1771 by the engineer John Montrésor. It was heroically held by the Americans under British siege until they were forced out on Nov. 15, 1777. It was rebuilt from 1798 to 1800 according to L’Enfant’s design and enlarged in the 19th century. It remained a U.S. military post until the 1950s.
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Philadelphia, Pennsylvania · United States
