...to leave his bivouac in Pleasant Valley at six o'clock in the morning; taking the Keedysville road, he would be able to reach the field of battle toward ten o'clock. Porter, with his second division, Morrell 's, was also to reach it in the course of the morning. The entire Federal army, except Couch's division, would then be concentrated on the Antietam, and the opportunity for crushing a divided enemy&...