Statistics for occurrence #1 of “Fort Warren” in chapter 2 of Col. J. Stoddard Johnston, Confederate Military History, a library of Confederate States Military History: Volume 9.1, Kentucky:

...ht of the 18th of September, 1861, were dragged from their beds and without warrant or charge preferred against them, were carried across the Ohio into Indiana, and thence sent east and imprisoned in Fort Warren , Boston harbor. Next day, under the false pretext that the Southern men were going to seize Lexington, but having really in view the arrest of ex-Vice-President John C. Breckinridge and other promi...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Fort Warren (Massachusetts, United States) 1,093 2 11 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.