Statistics for occurrence #1 of “Johnston's Island” in article 12 of The Daily Dispatch: August 8, 1863., [Electronic resource]:

...used to recognize it, when he became somewhat reserved and thoughtful He seemed to fear that he would be placed in uncomfortable quarters, as it was reported that he and his officers would be sent to Johnston's Island , which he was told was a cold, bleak place, and that the prisoners were treated roughly. We told him such was not the case, but that he would, no doubt, be closely confined and closely watched...
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† 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.