Statistics for occurrence #1 of “Md.” in chapter 7, regiment DE1, section c.7.10 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

...arch 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 Charlestown October 16-17. ...
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