Statistics for occurrence #1 of “Johnson's Island” in article pos=29 of The Daily Dispatch: July 28, 1863., [Electronic resource]:

...vernor. The trial of Dr. Wright, of Norfolk, is progressing at Fortress Monroe. About 500 Confederate officers, including Gens. Archer and Jones, arrived at Pittsburg Monday, on route for Johnson's Island . Ten thousand rebels are confined at Fort Delaware.
...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
† Johnson's Island (Ohio, United States) 590 2 12 0 0 user votes
Johnson's Island (Illinois, United States) 2 0 0 0 0 user votes
Johnson's Island (Florida, United States) 0 0 0 0 0 user votes
Johnson's Island (Michigan, United States) 0 0 0 0 0 user votes
Johnson's Island (North Carolina, United States) 0 0 0 0 0 user votes
Johnson's Island (Tennessee, United States) 0 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.