Statistics for occurrence #1 of “Washington, D. C.” in chapter 28 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

... xmlns:ptext="ptext" xmlns="http://www.w3.org/TR/xhtml1/strict"> Organized at Trenton, N. J., under authority of the War Department August 14, 1861, as Halsted's Cavalry. Left State for Washington, D. C. ; four Companies August 24 and six Companies August 31, 1861. Attached to Heintzelman's Division, Army of the Potomac, to March, 1862. Wadsworth's Command, Military District of Washington, to ...
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