Joey,
I'm a novice too, and take some of this with a grain of salt unless there's a military or bible record to back it up.
I hope Larry's children don't toss his papers out one day.
I've seen Samuel's middle name spelled differently. I've outlined his family for you on the following link: http://boards.rootsweb.com/surnames.sartin/319/mb.ashx ..misstated before, I'm his great granddaughter.

There is more Sartin history here,& query John Sartin: http://search.freefind.com/find.html?id=86880910&pid=r&mode=ALL&n=0&query=%22John+Sartin%22

Most Sartin family branches believe Salina Smith was married to David (Robert) Sartin, who with his brother James, the youngest brothers, were killed in the war. I found on one of the rosters that they were listed as sharpshooters, I guess that would be considered today's infantry riflemen. Most likely, at 17 and 18, they had a chance to go squirrel hunting before the war.
I need to look up what was considered light artillery in the Civil War -
Salina is found in a war era census as being a part of Alfred's household. She may have been invited to live in his household after being widowed,
though our Sartin branch has her listed as Alfred's first wife, maybe mistakenly. One can assume things from a census listing, and I try to remember that extended families could have been the norm, or esp. necessary then.