I have been working on the same line but can't seem to find the information that you have. Can you please share the documentation that you have on Sarah Anderson. I also cannot locate "Henry Co". If I can find some more of this information, I might be able to get a little further into the family line.
"William (Billy) Gibson served in the CSA, enlisted in the Fall of 1862 in Co. H. 15th Conf. Calvary under Capt. Brown. He was in the hospital at the close of the war when he was discharged. They moved to Molino, Escambia Co., FL in Feb. 1879.
Family lore, as well as personal characteristics, indicate Billy and/or Sally were at least part indian. I recently found where the Lower Creeks were located in Henry Co., where Sally indicated on the penion application she was born. The were married in Dale Co. This is not far from Geneva Co. So I thought I'd drop you a line to see if any of the names sound familiar."
Joseph E. Gibson