Rogan's regiment should be the 30th Ark Inf. It was redesignated in Early 1863 when the original 30th was redesignated as the 25th Ark Inf. All units east of the Miss River were 1st-30th, all west 26th-39th with the 40 series mounted Infantry. The 39thArk Inf was that of Brig Gen A T Hawthorne and Col John B Cocke. Hawthorne's brigade as part Churchill's Div was in the vicinity as well but can't remember if any actually were present there during the battle. (34th, 35th, 37th, and 39th Regiments, not sure on which artillery was with them)