carried to the rear, richardson was treated at a field hospital. his wound was not considered life-threatening, and he was given a room in major general george b. mcclellan's headquarters, the pry house. president abraham lincoln paid his respects to the wounded richardson during a visit to the battlefield in october. however, infection set in, and then pneumonia, which claimed the life of the popular general in early november. he was among six generals to be killed or mortally wounded at antietam.