Several family trees on ancestry.com have William Hamilton Renick, b. 2 Sep. 1815, Madison County, Alabama, d. 1892, Baxter, TX. Son of William Renick (born 1779) and Phoebe Titus. If these dates are correct, the father would have been 82 years old when the war started. The son would have been 45, and it would be unlikely (although not impossible) for him to have served in any other than a reserve capacity, and probably not at all.