The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 2: Two Years of Grim War.
Francis Trevelyan Miller, Ed.

Creek a few miles from where it flows into the Potomac. He made a display of force, exposing his men to the fire of the Federal artillery, his object being to await the coming of Jackson's command from Harper's Ferry. It is true that Jackson himself had arrived, but his men were weary with marching and, moreover, a large portion of his troops under A. P. Hill and McLaws had not yet reached the field.

McClellan spent the day arranging his corps and giving directions for planting batteries. With a few companions he rode along the whole front, frequently drawing the fire of the Confederate batteries and thus revealing their location. The right wing of his army, the corps of Generals Hooker, Mansfield, and Sumner, lay to the north, near the village of Keedysville. General Porter with two divisions of the Fifth Corps occupied the center and Burnside was on the left of the Union lines Back of McClellan's lines was a ridge on which was a signal station commanding a view of the entire field. Late on the afternoon of the 16th, Hooker crossing the Antietam, advanced against Hood's division on the Confederate left. For several hours there was heavy skirmishing, which closed with the coming of darkness.

The two great armies now lay facing each other in a grand double line three miles in length. At one point (the Union right and the Confederate left) they were so near together that the pickets could hear each other's tread. It required no prophet to foretell what would happen on the morrow.

Beautiful and clear the morning broke over the Maryland hills on the fateful 17th of September, 1862. The sunlight had not yet crowned the hilltops when artillery fire announced the opening of the battle. Hooker's infantry soon entered into the action and encountered the Confederates in an open field, from which the latter were presently pressed back across the Hagerstown pike to a line of woods where they made a determined stand. Hooker then called on General Mansfield to come to his aid, and the latter quickly did so, for he had led