I do have David Buchanan married to Catherine Twiner Dec. 22, 1862 in Yazoo Co. Catherine is the daughter of George Twiner (1805-1868)and wife Mary Lammons Twiner. Catherine was first married to James Horne and then to John R Boyd before her marriage to David Buchanan.
It is interesting to note that the Mrs. Sarah Buchanan in the 1841 Mississippi census in Yazoo Co was next door to Joseph W Sanders. You are sure that your Sarah was a Herring? Sarah Buchanan was living with JW Sanders in 1860. Their are of course two Sarah's who both married Buchanans. My interest lies in both the Sarah who is the mother of JW Sanders and also the Buchanan's who married into the Twiner family. Do you have any info on Nancy's brothers?