Statistics for occurrence #1 of “Washington, D. C.” in chapter 18 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

...I ). Culpeper September 14. Sharpsburg September 15. Capture of Longstreet's trains (Cos. H, I ). Rapidan Station September 16. Duty in the Defenses of the Upper Potomac covering Washington, D. C. , till December. Manassas, Va., October 23-24. Affair opposite Williamsport October 29 (Detachment). Reconnoissance from Bolivar Heights to Rippon, W. Va., November 9 (2 Cos.). Reconno...
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