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

...f that city April 23, 1861. Mustered out July 16, 1861. Organized at Washington, D. C., for the defence of that city April 23, 1861. Mustered out July 23, 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 18, 1861. Mustered out July 18, 1861. Or...
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