Statistics for occurrence #1 of “Fortress Monroe” in article pos=65 of The Daily Dispatch: September 17, 1861., [Electronic resource]:

... Martin Green, with 180 head of cattle, which they said they were driving to Chicago, were arrested near Salem, Iowa, yesterday, and the cattle confiscated. The men were held as prisoners. Fortress Monroe Sept. 12. --A flag of truce has gone to Norfolk to-day with Mrs. Phillips, of Washington, who was retained some time in her own house as a prisoner, several Southern ladies and released Confed...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Fortress Monroe (Virginia, United States) 7,630 8 276 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.