XI and XII Corps, Army of the Potomac
After the Wheeler-Roddey Raid, a Confederate attack on the Union wagon train near Andersons Crossroads in the Sequatchie Valley, October 2, 1863, the War Department recognized the importance of sending reinforcements to Chattanooga.
Communication related to the transfer of the Eleventh and Twelfth Corps, Army of the Potomac, to Bridgeport, as reinforcements in the Chattanooga and Chickamauga Campaigns, is found in Official Records, Series 1, Volume 29, Part 1 (Reports), pages 286 and forward (several pieces of communication); and in Series 1, Volume 30, Part 1 (Reports), pages 33-40 (Report No. 1, General H.W. Halleck).
Official Records, Series 1, Vol. 29, Part 1 (Reports), 286-
Various letters to and from the War Department discuss the transportation of these troops to Nashville, Tennessee, their arrival at Bridgeport, Alabama, and the importance and difficulty of transporting their horses and equipment. The 11th Corps was under Oliver O. Howard. The 12th Corps was under Slocum.
Series 1, Volume 30, Part 1 (Reports), pages 33-40
Report No. 1, General Henry W. Halleck to E.M. Stanton, Secretary of War; specifically, pages 36-37 mention the detachment of the Eleventh and Twelfth Corps, Army of the Potomac.
Subject: XI and XII Corps - transportation to Bridgeport, Alabama