Arnie, you may already have these sources, but in case you don't:

"Lookout Mountain and Missionary Ridge" SOUTHERN BIVOUAC, Volume 1, pages 397-399. Written by William F. Dowd.

"Recollections of the Organization and History of the 24th Mississippi Regiment, CSA" William McCardle Papers, Catalog #Z101, Mississippi Department of Archives and History. Written by William F. Dowd.