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

...defence of that city April 18, 1861. Mustered out July 16, 1861. Organized at Washington, D. C., for defence of that city April 22, 1861 Mustered out July 22, 1861. Organized at Washington, D. C. , for the defence 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. ...
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