Statistics for occurrence #1 of “Washington, D. C.” in chapter 27 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

...ch 6. Duty at and in the vicinity of Winchester, and in the Dept. of the Shenandoah, also at Poolesville, Md., till July, 1865. Five Companies complete organization July, 1864, and ordered to Washington, D. C. Guard and patrol duty and operations against Mosby's guerrillas in the Defenses of Washington till March, 1865. Joined Regiment in the Shenandoah Valley. Regiment lost during service 5 Office...
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