In August , Herron was promoted to lieutenant colonel of the 9th Iowa Volunteer Regiment .
In August , Herron was fought in the battle of Pea Ridge , where he was wounded and taken prisoner , but exchanged shortly afterwards .
In August , Herron was promoted to lieutenant colonel of the 9th Iowa Volunteer Regiment and fought in the battle of Pea Ridge , where he was wounded and taken prisoner , but exchanged shortly afterwards .