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

...e of that city April 11, 1861. Mustered out July 11, 1861. Organized at Washington, D. C., for defence of that city April 17. 1861. Mustered out July 17, 1861. Organized at Washington, D. C. , for defence of that city April 22, 1861. Mustered out June 11, 1861. Organized at Washington, D. C., for defence of that city April 11, 1861. Mustered out July 11, 1861. Or...
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