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

...ce of that city April 22, 1861. Mustered out July 15, 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 20, 1861. Mustered out July 20, 1861. Organized at Washington, D. C., for defence of that city April 22, 1861. Mustered out July 22, 1861. Or...
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