Statistics for occurrence #1 of “Washington, D. C.” in chapter 209 of Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 11.:

...ch the First division of cavalry, which I was then commanding, and which was at that time encamped near Lee's Mills, Prince George county, Virginia, to City Point, for the purpose of embarking it for Washington, D. C. The division moved according to orders, and commenced to embark on the night of the thirty-first. It was concentrated at Harper's Ferry, Virginia, by the night of the ninth of August following....
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