Young Marshall of Sumter County, Georgia enlisted on 11 June 1861 as a Private in the "Americus Volunteer Rifles", later designated Co. K, 9th Georgia Infantry. The enlisting officer was James M.D. King; either Marshall looked older than his age on enlistment or King did not ask many questions of his 15-year old recruit. As a part of the Georgia brigade commanded by George T. "Tige" Anderson, the 9th Georgia participated in every major engagement of the Army of Northern Virginia from 1862-1865 and was also at Chickamauga. The youthful Marshall was to prove a resilient warrior: listed as present for duty except a furlough in August 1863, he recovered twice from combat wounds and was one of the few survivors of his regiment present to surrender at Appomattox. Despite the loss of his older brother Joseph, killed at Sharpsburg on 17 September 1862 while serving with the 4th Georgia Infantry, Young Marshall remained unscathed until 2 July 1863, the second day of the Battle of Gettysburg. In the late afternoon, as part of Hood's division on the right flank of Lee's army, Anderson's brigade advanced in support of the first line on the left of the division. Driving forward more than a mile, the 9th Georgia on the extreme left of the brigade sustained 189 casualties as they pushed through Rose's Woods and the Wheatfield. After fighting more than three hours, they were finally halted upon reaching heavily defended Little Round Top. At some point during these actions, Private Young Marshall received a "ball [in] neck" and a fractured clavicle; he fell into Federal hands on 5 July but was later paroled and eventually returned to duty. Marshall was wounded again slightly in the head at Petersburg on 20 July 1864. This period Brady image, taken from the Wheatfield Road just after the Battle of Gettysburg, shows Little Round Top (center) and Big Round Top (right) from the northwest looking southeast. The limit of G. T. Anderson's advance occurred on the right of the image, at the base of Little Round Top.