I have been tracking down my wife's Confederate ancestor (Calvin Watson) from Edgefield Co., SC. I seem to have him placed with Co B, 6th South Carolina Cav. I just recently received his War Records from the National Archives. He served from June 1862 till the end of the war.
Calvin Watson is also listed on the South Carolina 2nd Artillery Regiment Co K-Edgefield Hussars, with a mention of a transfer behind his name. I believe these are the same man.