Statistics for occurrence #1 of “Potomac river” in chapter 38, page 565 of Allan Pinkerton, The spy in the rebellion; being a true history of the spy system of the United States Army during the late rebellion, revealing many secrets of the war hitherto not made public, compiled from official reports prepared for President Lincoln , General McClellan and the Provost-Marshal-General .:

...ements for the defense of Washington, and placing General Banks in command of the troops at that place. By this time it was known that the mass of the rebel army had passed up the south side of the Potomac river , in the direction of Leesburg, and that a part of the army had crossed the river into Maryland. The uncertainty of Lee's intentions greatly distracted the authorities at Washington for the safety...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Potomac River (United States) 286 2 0 0 0 user votes
Potomac River (Maryland, United States) 2 0 0 0 0 user votes
Potomac River (Maryland, United States) 2 0 0 0 0 user votes

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