On Caldwell's left, the sunken road winds among the hills. The Rebels still held that section. Colonel Barlow reconnoitered the ground. He commanded the Sixty-first and Sixty-fourth New York regiments. He ordered them to march by the left flank. They pushed out into the fields towards Sharpsburg, gained the rear of the Rebels still holding the road, and forced three hundred to surrender. He also captured their stand of colors. There is once more a lull in the battle. Longstreet is making preparations to regain his lost ground. Having failed on French's right, by Rulet's, he renews the attack on the left. But Colonel Cross of the Fifth New Hampshire, who has watched with eagle eye the Indians of the western plains, who has tracked the grizzly bears of the Rocky Mountains, who is brave as well as vigilant, discovers the movement. It is the same which has been successful against Sedgwick. The left of Caldwell is far advanced towards Dr. Piper's, when Colonel Cross discovers the Rebel force making a rapid movement to gain a hill in his rear. He changes front, and moves his regiment to gain the hill. The two lines are within close musket range. They make a parallel movement, firing as they run. It is an exciting race. Colonel Cross cheers his men, and inspires them with his own untamable enthusiasm. He gains the hill, faces his troops towards the enemy, and delivers a volley. It checks their advance a moment, but, rallied by the officers, they rush on, charging up the hill. Cross, reinforced by the Eighty-first Pennsylvania, which has followed him, gives the word. "At them, boys!" He leads the counter charge. His troops rush down the hill. The Rebels do not wait their coming, but break in confusion. Another stand of colors, those of the Fourth North Carolina, and more prisoners, are the trophies. Again Longstreet tries to drive back the center, and regain the road; and again Barlow repulses him, charging up through the cornfield, almost up to the Hagerstown turnpike, and gaining Dr. Piper's house. Vincent's and Graham's batteries gallop to the hills south of Rulet's, wheel into position, and reply to the batteries on the hills along the turnpike, north of Piper's. But the Rebel batteries by the church enfilade the ground west of the sunken road. Hancock, who now commands Richardson's division, can hold his ground, but he cannot advance. Thus by one o'clock, Lee has been pushed from his advanced lines on the right and on the center. He still holds the rocky ledges in the woods behind the church; he maintains his position along the turnpike, and holds the lower bridge, where Burnside is endeavoring to force a crossing. All the while, there is a continuous cannonade by Poffenberger's, by Miller's, and in front of the church. There are occasional volleys of musketry, and a rattling fire from the skirmishers. GENERAL FRANKLIN'S ARRIVAL.