On May 2, 1863, while returning from a scouting mission during the Battle of Chancellorsville, Virginia, Confederate General Thomas J. “Stonewall” Jackson was fired upon and wounded. Dr. Hunter McGuire removed a spherical ball 0.675 in. in diameter from Jackson's right hand and amputated his left arm. Although he survived the wounding, he developed pneumonia and died on September 10, 1863. Because the Union Army had abandoned the use of the smooth-bore musket that fired this type of ammunition the previous year, investigators were able to conclude that Jackson had been shot by his own troops, who were still using that firearm. Many believe this to be the first recorded instance of the use of firearms identification for forensic purposes.