Hugh, Thanks for adding the additional information which I negelected to do. One point I would like to add, it is possible that all of the Holts of the 19th Arkansas could be related, if a person knew the family history, perhaps they could supply the first name of J. E. Holt.
Of course it is very possible that Joseph Holt did not die as a POW, but all clues indicate we are on the right trail.
GP