Reference: Alabama Department of Archives & History. Custodian of the original pictures. Confederate Officers photo album. http://www.archives.alabama.gov/conoffalb/index.html
William Whann Mackall was born in Cecil County, Maryland, January 18, 1817, and was graduated from West Point at the age of twenty in the class of 1837 —also that of Braxton Bragg. He was severely wounded in the Seminole War, and was twice brevetted for gallant and meritorious conduct in Mexico. On May 11, 1861 he was appointed lieutenant colonel and assistant adjutant general, U.S.A., but declined the promotion. He resigned his commission on July 3. Appointed lieutenant colonel in the Confederate adjutant general's department, he served on the staff of General Albert Sidney Johnston, and was promoted brigadier general to rank from February 27, 1862. He was captured at Island No. 10 in April, and was later exchanged. After holding various district commands, he became chief of staff to his old classmate, Bragg, in April 1863. Relieved at his own request after the battle of Chickamauga, he was effusively commended by Bragg for his services. He again joined the Army of Tennessee, as chief of staff to General Joseph E. Johnston in January 1864. He served most efficiently until the relief of Johnston by Hood in front of Atlanta, when he declined to serve under the new army commander and once more was relieved at his own request. He saw no further active service. After the war General Mackall resided in Fairfax County, Virginia, where he owned several farms. On one of them, "Langley," his death occurred on August 12, 1891, and on another, "Lewinsville," near McLean, Virginia, he is buried.
Ref: Generals in Gray, Lives of the Confederate Commanders by Ezra J. Warner. Printed by Louisiana State University Press, Baton Rouge and London.