Statistics for occurrence #1 of “Fortress Monroe” in year 1861, month June, day 3 of Rebellion Record: a Diary of American Events, Diary from December 17, 1860 - April 30, 1864:

...
Quartermaster T. Bailey Myers arrived at New York from Fortress Monroe , bringing from that quarter a secession flag as a present to the Union Defence Committee. The flag was captured at Hampton village, near the fort, and when taken was flying from its staff on the ro...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Fortress Monroe (Virginia, United States) 7,630 215 276 21 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.