 They rallied after federal artillery gathered by Crittenden's artillery chief, Captain John Mendenhall, bombarded Breckinridge's troops.Promoted to brigadier general backdated to November 1862, Beatty's personal bravery at the Battle of Chickamauga in September 1863 received the commendation of XXI Corps commander Thomas L. Crittenden, who wrote, "With pride I mention the name of Brig.Gen.