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 13, 1861. Mustered out July 10, 1861. Organized at Washington, D. C., for defence of that city April 24, 1861. Mustered out July 24, 1861. Organized at Washington, D. C. , for defence 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. Or...
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