The Antietam in front of Burnside was deep, not fordable, flowing in the bottom of a charming valley, and overshadowed by trees. There was a solid stone bridge over it, with three arches, rising picturesquely in the centre, with stone parapets on the sides, the parapets spreading at both ends of the structure. One would almost imagine that it was an old Italian bridge transported to our wooden-building land. The side of the valley held by the rebel troops rises sharply, not densely wooded, but covered by large trees thickly placed, as in an old English park. Along the top of this ridge ran a solid stone wall, thicker and of heavier stones than any we saw in the neighborhood. Where the wall ended rifle pits had been dug. Behind the massive trunks, and in the branches of the old trees, behind this wall and in the pits, were crowded the sharpshooters of the rebels. The ascent from the bridge out of the valley on the enemy's side, was too steep for a straight road up the ridge. If ever a bridge could be defended, that should have been; the only disadvantage the rebels were under was that they could not sweep it with artillery. Our left had vainly attempted to cross the bridge; twice had they been repulsed. On the right our troops were hard pressed; much of the ground gained in the morning had been lost; Hooker was wounded, Sumner's corps routed, Mansfield killed, and his corps beaten back. Then McClellan ordered Burnside to take the bridge, and hold it at any cost. Burnside sent some troops farther down the river, where it was fordable. He called up one of his old brigades that had been with him in North Carolina, saying, if any brigade could take the bridge, that one would. It was composed of the 51st New York, 51st Pennsylvania, 21st Massachusetts, and a Rhode Island regiment; on their colors were inscribed, 'Roanoke,' 'Newbern,' two of our most glorious victories. With these veteran troops was the 35th Massachusetts, a new regiment that had left home only a month before, but who nobly did their part. Down went the 51st Pennsylvania in column in the advance, at the run, shouting and crowding and firing as they hurried across the bridge, bringing down the rebels from the trees, suffering themselves, but never halting. They crossed and deployed on the other side. Next came the 35th Massachusetts, over the bridge, up the valley, then forming in line of battle on the top of the small hill commanding the stream. The enemy were drawn up before them, quite a distance off, on the top of the next hill. Every inch of ground between was commanded by the rebel fire; but our brave fellows charged on up this hill, driving the foe before them: they did not halt there, for another still higher hill, which could now for the first time be seen farther on, rose up before them. Nothing daunted, they followed up their charge, and drove the enemy from this hill, and took this most commanding position. There they halted, close