Washington, D.C. Company M, 9th New York Heavy Artillery, in a fort.

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Washington, D.C. Company M, 9th New York Heavy Artillery, in a fort. LOC Summary: Photograph of Washington, 1862-1865, view of the defenses of Washington. Date Created/Published: 1865 August. Civil War image provided by LOC. Original medium: 1 negative : glass, wet collodion.