I believe that the massacre at the railroad station took place on the morning of Sept 27th. Major Johnson was notified and attempted a pursuit of Anderson and the battle took place on that same afternoon. All of the death records I have seen show 9/27 as the date for the soldiers at the station and the battle.
Do you have a burial place for your ancestor?
I have copies of military records of most of the men involved at the RR sta and will be glad to share.
E D
edwilson10@comcast.net