Johnson's Island, shown in an aerial here, was a military camp founded in 1862. Johnson's Island was a Union prison for Confederate officers during the American Civil War. It was located in Sandusky Bay of Lake Erie, near Sandusky, Ohio. The prison was built on this island for several reasons. Because of the island's isolated location, it would be very difficult for prisoners to escape. At the same time, the island was near several important Ohio cities and lines of road, rail and water transportation. It was relatively easy to acquire building supplies to construct the prison, as well as to secure food to feed the inmates. The prison at Johnson's Island opened in April 1862. It continued to house prisoners until September 1865. Estimates...