After capturing Philadelphia in 1777, the British spend weeks trying to open the Delaware River so that the navy can supply the occupying army. The Americans spent years installing barriers and forts to make the approach difficult and dangerous.
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Book Recommendation of the Week: The Pennsylvania Navy: Defending the Delaware 1775-1781, by John W. Jackson.
Online Recommendation of the Week: Ford, Worthington C. Defences of Philadelphia in 1777, Brooklyn: Historical Printing Club, 1897: https://archive.org/details/defencesofphilad00ford
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