... first class were Johnson's Island, in Sandusky Bay, Ohio; City Point, Maryland, and Rock Island, in the Mississippi River. Among the second were Camp Douglas, at Chicago, Illinois; Camp Butler, at Springfield, Illinois ; Camp Morton, at Indianapolis, Indiana; Camp Chase, at Columbus, Ohio; and the Barracks, at Elmira, New York. The Gratiot Street Prison in St. Louis had been an old medical college, and Myrtle St...