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

...ope's Campaign in Northern Virginia August 16-September 2. Fords of the Rappahannock August 28-26. Plains of Manassas August 27-29. Battle of Bull Run August 29-30 (Reserve). Moved to Washington, D. C. , and duty in the defenses of that city and Alexandria, Va., till February, 1865. Repulse of Early's attack on Washington July 11-13, 1864. Consolidated with 2nd Regiment District of Columbia ...
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