contains a breakdown of the corps of the Union Army and Army of the Cumberland;
Five elements: Crittenden XXI Corps; Thomas's XIV Corps, Alex McCook's XX Corps (Union Army); David S. Stanley's Cavalry Corps (Army of the Cumberland); and Gordon Granger's Reserve Corps. https://www.nps.gov/parkhistory/online_books/civil_war_series/10/sec2.htm
The National Park Service site (above) has a summary of events at Chickamauga, and I found it helpful in identifying the main commanders in the Army of the Cumberland. Many sites only mention the top three of Rosecrans' commanders: Thomas, McCook, and Crittenden; this one adds Stanley and Granger, which certainly helped me understand why my guys crossed the mountain at Stevenson, Alabama (with Stanley's Corps, not McCook's; or at least, if under McCook, more specifically in Stanley's Corps). And, by the way, this one doesn't mention Washington Lafayette Elliott, who relieved David S. Stanley when he fell ill in 1863. The following source actually gives the day for that fact, not just the month and year:
16 November 1863: General D. S. Stanley (Davis S. Stanley): "relieved from duty as chief of cavalry, Army of the Cumberland, and General W. L. Elliott placed in command."
Source: History of the First Regiment of Tennessee Volunteer Cavalry, by W. R. Carter, The Overmountain Press, 1992 (reprint), 108.
Short URL: http://bit.ly/Source_David-S-Stanley-relieved-of-duty-for-illness