Statistics for occurrence #1 of “Washington, D. C.” in chapter 17, regiment reg157 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

...64. Moved to Franklin January 7, thence to Brashear City and New Orleans January 18-20. On Veteran furlough February and March. Moved to Annapolis, Md., April 15-19, thence to Camp Barry, Washington, D. C. , April 20. Duty there and at Forts Smith and Strong, Defenses of Washington, till July. Repulse of Early's attack on Washington July 11-12. At Camp Barry till July 30. Ordered to Tenn...
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