Very good.
According to informaiton gleaned from the Port Gibson, Claiborne County, Missisisppi area
Colonel J H Duncan of Port Gibson, Mississippi, was in command at Fort Gregg.
He must have gone down early in the fight and the Command passed to Captain A K Jones, as the Senior Officer on the Field at that Moment.
I found later where Colonel Duncan returned to Port Gibson.
He died a few years later and I thought was / is buried in Wintergreen Cemetery, the Port Gibson Town Cemetery, but I cannot find him on Find a Grave. Still looking.
Captain A K Jones returned to Port Gibson and served a long and useful life serving many years as Chancery Clerk of Claiborne County,
Captain Jones is buried in Wintergreen, the Port Gibson Town Cemetery, see Find a Grave Memorial # 57683098.
Sam P