Well I'd expect it would be in the Confederate Army. But it could be an honorary title as with Col. Sanders of fried chicken fame. Once you've become a volunteer and thus a member of WikiTree, you should be able to use the recently improved research function and see what sources match with your profiles. Meanwhile I'll do a quick look and see if I can find the answer as low-hanging fruit...
Yes, Ancestry.com has:
William Elbert Welborn Obituary
This article was found in The Sentinel-Journal, Pickens, SC July 16, 1908
He was indeed in the confederate army for 4 years, rising to Col. and being well respected.