Statistics for occurrence #1 of “Fortress Monroe” in year 1861, month June, day 28 of Rebellion Record: a Diary of American Events, Diary from December 17, 1860 - April 30, 1864:

...mand of Colonel Edward Frisbie; the Thirty-second N. Y. S. V., under the command of Colonel Matheson, and Colonel E. D. Baker's California Regiment, left New York for the seat of war.--The latter for Fortress Monroe .--(Doc. 50.) The Charleston (S. C.) Courier, of to-day, prints the following from a private letter received from Manassas Junction: Our force is less than has been supposed. Two days ...
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.