Sharon
Is it possible that this picture you have could be scanned and posted some way, or that you could email it?
I'm sure you'll be getting a lot of request's for this since your message also posted to the Sultana mailing list!
What reference material do you have on Cahaba? I have two that survived the explosion:
Shetterson, Jno.(John), private .... company K, 18th Michigan Infantry and
Shetterson, Isadore, Private, Co K, 18th Michigan Infantry
This is the incorrect spelling of their surname, but seems to be what the records reflect. The actual spelling was Chattelreau, but most commonly seen as Shet(t)elroe.