http://www.couchgenweb.com/civilwar/quantril.htm
"Vaughan, Joe - Vaughn, Dan -"
I've also brought your message to the attention of our group's members and a few of them are very knowledgable in regard to the Civil War Vaughn/Vaughans. This list seems to imply that Dan and Joe Vaughan were two different men but your document certainly seems to indicate they were the same man.
~Jay~