Statistics for occurrence #1 of “Camp Douglas” in chapter 36 of Horace Greeley, The American Conflict: A History of the Great Rebellion in the United States of America, 1860-65: its Causes, Incidents, and Results: Intended to exhibit especially its moral and political phases with the drift and progress of American opinion respecting human slavery from 1776 to the close of the War for the Union. Volume II.:

...avery. Prisoners of war are apt to complain of harsh treatment, and not without reason; and such complaint was made by Rebel prisoners against our officers who held them in custody, especially at Camp Douglas (Chicago), and on Rock Island, in the Mississippi — the former having been the focus of repeated conspiracies to overpower their guards, break out, and, in conjunction with secret allies outsid...
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Entity Corpus Doc Corpus Doc  
Camp Douglas (Wisconsin, United States) 14 0 0 0 0 user votes

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