Statistics for occurrence #1 of “Long Bridge” in chapter 6 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.:

...rrent effect of fortifications were mainly responsible for the Confederates not pressing their victory to the logical conclusion of occupying the capital. The stream of fugitives crowding across Long Bridge and Aqueduct Bridge after the disaster of Bull Run, July 21st, announced to the people of Washington, to the people of the North, and to the people of the world the initiation of a mighty struggle. ...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Long Bridge (Pennsylvania, United States) 258 22 2 0 0 user votes
Long Bridge (Louisiana, United States) 12 0 0 0 0 user votes
Long Bridge (New York, United States) 10 0 0 0 0 user votes
Long Bridge (Louisiana, United States) 0 0 0 0 0 user votes
Long Bridge (New Jersey, 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.