Statistics for occurrence #1 of “Washington, D. C.” in chapter 7 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

... and Merrimac in Hampton Roads, Va., March 8-9, 1862. Expedition to Norfolk May 9-10. Occupation of Norfolk May 10, and duty at Norfolk, Portsmouth and Suffolk till September 8. Moved to Washington, D. C. , thence to Antietam, Md., September 8-16. Battle of Antietam, Md., September 16-17. Moved to Harper's Ferry, W. Va., September 22, and duty there till October 30. Reconnoissance. to Charl...
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