Four Union officers prominent in the arrangements for exchangeColonel C. C. Dwight, of New York, was the Federal agent of exchange in the West. General Lew Wallace, the author of ‘Ben Hur’ and ‘A Prince of India,’ was the officer assigned to take command of Camp Chase in Ohio, where he found 3,000 paroled Union soldiers who had not yet been exchanged and refused to do even police duty, claiming that they would perform no soldiers' work until they were formally exchanged. General E. A. Hitchcock was the Federal commissioner of exchange in the East. It was due largely to the efforts of General Lorenzo Thomas that exchange arrangements were perfected. He was temporarily detached from his position as adjutant-general to act as agent in the East.