I have a lot of details but not enough. This is from a friend.

Hi,
I am trying to write a history of the Battle of Campbell’s Station, Tennessee, 16 November 1863. There were three batteries of the 9th Georgia Battalion, C, D, and E that came with James Longstreet up to Loudon, Tennessee. In the Official Records, Volume 31, Part 1, p. 478, E. Porter Alexander states that one battery was left at Loudon. Two of these batteries were with Longstreet at Campbell’s Station, one had to left at Loudon for lack of horses to move it. My question is which battery was left?
Any help with this would be appreciated. Also if you have some information on this, what is the source of your information?
Thank you,
Gerald Augustus