Lt. Col. Jefferson Mirabeau Lamar commanded Cobb's Legion Infantry at Crampton's Gap. Lamar graduated from the University of Mississippi before opening a law practice in Covington, GA. A month after his July 1861 marriage to his cousin, Mary Ann Lamar (granddaughter of Mildred Cobb Jackson), he was commissioned captain of the "Lamar Infantry," a unit later designated as Company A of the Legion. Highly regarded by his commanding officer, Col. T.R.R. Cobb. Lamar was also popular with other officers in the Legion who elected him major in 1861 and lieutenant colonel in July 1862. Tragically, Lamar was wounded September 14, 1862 at Crampton's Gap and died the following day in Burkittsville, MD. His brother, U.S. Supreme Court Justice L.Q.C. Lamar, wrote, "I never knew a more perfect being from the time of his childhood up to the day of his death."