... Sharpsburg to Hagerstown runs nearly north and south, and, for at least a mile, between somewhat parallel and rather bold limestone ridges. At the Dunker church, a little more than a mile north of Sharpsburg , the Smoketown road enters this turnpike at an acute angle. By this latter road the Federal army advanced, having turned to the left, soon after crossing the Antietam. About half a mile above the...