Statistics for occurrence #1 of “Bush River” in chapter 7 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

... Organized at Wilmington, Del., May 22, 1861. Attached to Dix's Command and assigned to duty on line of the Philadelphia, Wilmington & Baltimore R. R. at Havre de Grace, Elkton, Perryville, Bush River , Gunpowder, Northeast and Charlestown, guarding road and protecting bridges till August. Mustered out August 30, 1861. Organized at Wilmington, Del., September 10 to October 19, 1861. ...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Bush River (Maryland, United States) 10 2 0 0 0 user votes
Bush River (Virginia, United States) 12 2 0 0 0 user votes
Bush River (South Carolina, United States) 2 0 0 0 0 user votes
Bush River (Maryland, United States) 1 0 1 0 0 user votes
Bush River (South Carolina, United States) 0 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.