My Civil War history only goes as deep as knowing his unit was assigned to Sherman's army in 1864 in Atlanta and further east, and the Shiloh battle was two years earlier. I understand that battlefield dead and wounded soldiers that died in field hospitals who were not shipped home (as described in This Republic of Suffering: Death and the American Civil War - a good read), were buried in dedicated cemeteries that are now the national veterans cemeteries. If he was in a field hospital near Savannah, TN when he died, then maybe his company was performing some rear guard duty, rather than up front with Sherman's advancing troops, and Nashville was convenient. If he died in the Savannah, GA hospital, then a burial in Nashville seems too far away, since closer cemeteries existed for Union dead during late 1864 in GA and the Carolinas. I will check the War of the Rebellion files at the Cornell web site and see if I can get a better fix on the location of the 29th Ohio regiment in late 1864 that may shed light on this question. Your research has generated a new interest, a common occurence in genealogy.
Regards,
Willard