Statistics for occurrence #1 of “Northeastern Virginia” in chapter 227 of Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 2.:

...eral Order No. 15, of August 17, 1861, from the Headquarters of the army, I hereby assume command of the Army of the Potomac, comprising the troops serving in the former departments of Washington and Northeastern Virginia , in the Valley of the Shenandoah, and in the States of Maryland and Delaware. The organization of the command into divisions and brigades will be announced hereafter. The following-named officers...
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