Statistics for occurrence #1 of “Johnson's Island, Ohio” in chapter 1.57 of Southern Historical Society Papers, Volume 35.:

...o, Camp Morton, Ind., and Camp Douglas, Ill.; though eventually most of them were assembled at Camp Douglas. The officers were imprisoned at various places—the Ohio penitentiary, at Columbus; Johnson's Island, Ohio ; Allegheny penitentiary, Pa.; Point Lookout, Md., and Fort Delaware, Del. It was claimed that the officers were confined for a while in the Georgia penitentiary. While Major McCreary was a prison...
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