Statistics for occurrence #1 of “Rappahannock River” in chapter 4.17 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: Volume 2.:

...iver was not actually closed to armed vessels, a virtual blockade of Washington, as the Potomac was concerned, was maintained until March, 1862, when the Confederate forces retired to the line of the Rappahannock River . The guns were then removed from the batteries, and the George Page was burnt. During the remainder of the war, the Potomac flotilla, commanded successively by Commodore A. A. Harwood and Comma...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.