 While this order was not approved until after the Battle of Prairie Grove, the battalion and the 39th (Hawthorn's) Arkansas Infantry Regiment fought side by side during the battle.They took part in the charges of Fagan's Brigade driving back the 20th Wisconsin, 19th Iowa, and 37th Illinois and 26th Indiana regiments when these Union troops ascended the ridge.After the retreat from Prairie Grove to Van Buren, the 39th (Hawthorn's) Regiment Arkansas Infantry Regiment underwent a major reorganization on December 16, 1862.