...of Burnside, though Warren's brigade, of Porter's corps, was subsequently posted in the woods on the left in support of Burnside's men. Sumner's corps was an eminence next to the right or North from Petter , and Gen. Hooker had the extreme right, in and behind the woods on the Antietam. The left riched to the Northwest across the Sharpsburg . The line was between four and five miles . The rebel left ...