Hi, in a book that came out in 2011 called Conversations With My Grandfather by Wink Dameron, Louis B. Claiborne being her grandfather, told her Ferdinand O. Claiborne was his first cousin and mentioned his being killed at Vicksburg. He also mentioned another "first cousin" Capt. Tollis Claiborne, Adjunct to Gen. Reynolds who commanded a Tenn. brigade was at Vicksburg and slightly wounded. At page 41.