This Vermonter was 46 years old when he led his division at Antietam. Another West Pointer, Richardson graduated from the Academy in 1841 and distinguished himself during the Mexican War. In 1855 he resigned his commission and moved to Michigan. Returning to service during the crisis of 1861, Richardson led a brigade during the First Battle of Bull Run and the Peninsula campaign. At Antietam he commanded a division in the II Corp that attacked the Sunken Road. Wounded by artillery while trying to bring up more guns, MGen Richardson died on November 3, 1862.