Defense of Washington - 6 views: 2 views of Chain Bridge, Pimmitt Run Bridge (small bridge near Chain Bridge), Block House for d

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Defense of Washington - 6 views: 2 views of Chain Bridge, Pimmitt Run Bridge (small bridge near Chain Bridge), Block House for defense of Aqueduct Bridge, and Georgetown Ferry. Date Created/Published: no date recorded on caption card. Pictures of the American Civil War provided by LOC. Original medium: 6 photographic prints.