The Virginia Regimental Series lists a man by this name in the 26th Va. no company given, no indication of his race. (not unusual if he was free, or mulatto) has his full name as Philip Tabb Yeatman, born 11/28/1829, died 3/18/1897, in Alexandria, Virginia.

I assume another man named Philip T. Yeatman, named as a 2nd Lieutenant in Co.A 34th Virginia.

Maybe someone with Fold 3 would have more info ?