There are lots of little clues in this oath of allegiance for Joseph Sledd which appears in Ancestry.com's "Union Provost Marshals' Papers, 1861-1867"
Joseph Sledd was of Bourbon County, Kentucky, when he made this declaration at Camp Douglas, Illinois, in February of 1865. Camp Douglas was a Union Army prisoner of war camp for Confederate soldiers.
Sledd's appearance in these papers means that there's probably more information on his military service. This reference may just be the beginning of information available on Joseph Sledd.
Sledd was a grandson of Thomas and Sally (Tinsley) Sledd, Amherst County, Virginia, residents who migrated to Bourbon County, Kentucky in the very early 1800s. Sledd apparently survived his time at Camp Douglas and later returned to Kentucky.