Dates: 1863 February-July. Size: 9.75 linear feet in 9 oversize folders. Chicago Public Library, Harold Washington Library Center, Special Collections. The collection is comprised of official returns, morning reports and various other personnel listings and reports for departments in the Army of the Potomac, which was the Union’s primary army fighting in the eastern theater during the American Civil War, 1861-1865. Commanding officers authorized the reports by signature, and so the signatures of many well-known military commanders appear. [Finding aid]