Statistics for occurrence #1 of “Unionists” in chapter 28 of Admiral David D. Porter, The Naval History of the Civil War.:

...imit. After partially destroying the works at Fort DeRussy, the squadron proceeded up to Alexandria which place submitted without a dissenting voice, many of the inhabitants professing themselves Unionists . The day after the arrival of the gun-boats Major-General Banks marched into Alexandria and the town was turned over to him by the Navy. The following day the squadron returned down the Red River...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Unionists 665 8 1 0 0 user votes
Baltimore Unionists 84 0 0 0 0 user votes
Virginia Unionists 28 0 0 0 0 user votes
Theeast Tennessee Unionists 22 0 0 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.