Statistics for occurrence #1 of “Potomac River” in chapter 26, page 455 of Alfred Roman, The military operations of General Beauregard in the war between the states, 1861 to 1865:

...-holes and quaker-guns or dummies, and anchored near the line of boom, apparently for its defence. The dummies were found quite effective in retarding the enemy's movements at Centreville and the Potomac River . Respectfully, your obedient servant, G. T. Beauregard, Genl. Comdg. Richmond, Nov. 17th, 1862. Genl. G. T. Beauregard: Secretary immediately authorized the casting of the 15-inch gun. Hop...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Potomac River (United States) 286 0 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

† 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.