Dang Stonewall Jackson,
I had a ggg-uncle who died of typhus at the Union POW camp in Elmira, New York too. By coincidence he had the same first, middle and last name as me. He was captured at the Battle of Helena. Basically, we lost every male member of the family over the age of 13. I think it was 14 or 15 all told. They were with the 11th, 12th, 13th, 17th and 18th Arkansas Infantry Regiments and one CS Marine Corp., aboard CSS Atlanta.
The Genealogy stuff is interesting, a tremendous amount of records on line, but really tedious to search through. The word is patience and perseverance.
One of the best Civil War site on the internet is at http://www.CivilWeek.com. It contains a day by day account put together with newspaper clippings, letters, official dispatches, and orders. Very well done.
Is your ggg-uncle buried at Woodlawn National Cemetery in Elmira? If he is and you can provide me with his name, rank, and unit, I’ll try to find his grave when I go there next spring and I’ll take a photo of it for you.