The Union loss has been very heavy,--Hooker, Sedgwick, Dana, Hartsuff, wounded, and Mansfield killed. Meade commands Hooker's corps, and Howard, with his one arm, commands Sedgwick's division. He lost his right arm at Fair Oaks, but he is in the saddle again. The Rebel dead are thick around the church, and in the field in front of it, and along the turnpike, mingled with those who had fallen from the Union ranks. Five times the tide of battle has swept over the ground during the morning. The officers point out the exact spot where they stood. They tell what happened. "We stood out there, in the center of the field," says an officer of the Tenth Maine. "We came up just as Ricketts was giving way. The Rebels were outflanking him, and his troops were streaming through the cornfield. The Rebels were pushing north towards Miller's. Our line of march was towards the west, which brought us partly in rear of their line. Those dead men which you see out there belonged to the Twentieth Georgia. They were on the right of the Rebel line. We gave them a volley right into their backs. They didn't know what to make of it at first. They looked round, saw that we were in their rear, then they cut for the woods. It forced back the whole Rebel line. Just then Corporal Viele, of company K, of our regiment, and a corporal of the Second Massachusetts, dashed after them, and captured the Colonel of the Twentieth Georgia, and a lieutenant." "And Lieutenant-Colonel Dwight, of the Second Massachusetts, captured a battle-flag," says a soldier of that regiment, his eyes sparkling with enthusiasm. "He brought it in under a shower of bullets, waving it over his head. He got clear back to the lines, and then was wounded, they say mortally." THE CENTER. There was a lull in the battle after the terrible fight around the church. General French's division, of Sumner's corps, followed Sedgwick across the Antietam. The division, after crossing the stream, turned to the left, marching through the fields towards the house of Mr. Muma. Richardson, as soon as he crossed the bridge, filed to the left, moved along the bank of the river, crossed a little brook which springs from the hillside near Rulet's, encountered Hill's skirmishers, drove them up the ravine, and formed his line under cover of a hill. French is in the ravine. Half of his division is north of the brook, the other half south. He has Weber's, Kimball's, and Morris's brigades. He forms his brigades, as Sedgwick did his, in three lines,--Weber in front, Morris in the second, and Kimball in the third line.