Statistics for occurrence #1 of “Fortress Monroe” in chapter 40 of Admiral David D. Porter, The Naval History of the Civil War.:

...deral vessels-of-war — which was as justifiable as any other hostile act. On the night of April 8th, 1864, while the Minnesota, flag-ship of Acting-Rear-Admiral Lee, was lying at anchor off Fortress Monroe , a dark object was seen, about two hundred yards distant, slowly passing the ship. It was thought to be a row-boat; and, in reply to the hail from the Minnesota, the answer came, Roanoke. By this...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Fortress Monroe (Virginia, United States) 7,630 72 276 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.