Statistics for occurrence #1 of “Washington, D. C.” in chapter 8 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

...tle of Antietam September 16-17. Sharpsburg, Shepherdstown Ford and near Williamsport September 19. Near Shepherdstown September 20. Mustered out September 12, 1865. Organized at Washington, D. C. , for the defence of that city April, 1861. Attached to Mansfield's Command, Dept. of Washington, to June, 1861. Stone's Expedition to July, 1861. Duty in the Defenses of Washington, ...
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