Statistics for occurrence #1 of “Washington, D. C.” in chapter 35, regiment PA104 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

...John's Island July 2-10. Operations against Battery Pringle July 4-9. Boudren's Causeway, James Island, July 9. At Hilton Head, S. C., till July and in Florida till August. Ordered to Washington, D. C. , and duty in the Defenses south of the Potomac to September. Moved to Harper's Ferry, W. Va., and duty escorting trains to Sheridan's army till November. Moved to Bermuda Hundred, Va., Novemb...
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