Statistics for occurrence #1 of “Columbus, O.” in chapter 1.28, section c.1.28.390, page 257 of Southern Historical Society Papers, Volume 30.:

...signal that would inform them of the capture of the manof-war Michigan, the throwing open of the prison gates at Camp Douglas, near Chicago, where 8,00 Confederates were confined; at Camp Chase, near Columbus, O. , where there were 8,000 more, and at Camp Morton, Indianapolis, with about 4,000. The 3,200 officers on Johnson's Island were to command this army of newly liberated Confederate soldiers and sweep ...
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