... become smaller than companies. Dabney, a careful statistician, in his Life of Jackson, estimates Lee's forces at Sharpsburg (Antietam) at 33,000 men, including the three arms of service. Three of Longstreet 's twelve brigades had gone to Harper's Ferry with Jackson. He (Longstreet) puts the strength of his nine brigades at Hagerstown on the morning of the 14th of September at thirteen thousand men. Acc...