At this farm, called Hazel Grove, during the night, and until just before daybreak, holding a position which could have been utilized as an almost impregnable point d'appui, and which, so long as it was held, practically prevented, in the approaching battle, a junction of Lee's severed wings, had lain Birney's and Whipple's divisions. This point they had occupied, (as already described,) late the evening before, after Sickles and Pleasonton had finished their brush with Jackson's right brigades. But Hooker was blind to the fact that the possession of this height would enable either himself or his enemy to enfilade the other's lines; and before daybreak the entire force was ordered to move back to Chancellorsville. In order to do this, the intervening swamp had to be bridged, and the troops handled with extreme care. When all but Graham had been withdrawn, a smart attack was made upon his brigade by Archer of Hill's command, who charged up and captured the Hazel Grove height; but it was with no serious Federal loss, except a gun and caisson stalled in the swamp. Sickles drew in his line by the right, and was directed to place his two divisions so as to strengthen the new line at Fairview. Reynolds's corps had arrived the evening before, and, after somewhat blind instructions, had been placed along the east of Hunting Run, from the Rapidan to the junction of Ely's and United-States Ford roads, in a location where the least advantage could be gained from his fresh and eager troops, and where, in fact, the corps was not called into action at all, restless however Reynolds may have been under his enforced inactivity. The Eleventh Corps had gone to the extreme left, where it had relieved Meade; Sykes was already formed on Reynolds's left, (having rapidly moved to the cross roads at dusk on Saturday;) while Meade with the rest of his corps, so soon as Howard had relieved him, went into position to support this entire line on the extreme right of the Army of the Potomac. Thus three strong army corps henceforth disappear from effective usefulness in the campaign. The Confederate position opposite Fairview had been entirely rectified during the night to prepare for the expected contest. The division of A. P. Hill was now in the front line, perpendicular to the road, Archer on the extreme right, and McGowan, Lane, Pender, and Thomas, extending towards the left; the two latter on the north of the road. Heth was in reserve, behind Lane and Pender. Archer and McGowan were half refused from the general line at daylight, so as to face, and if possible drive Sickles from Hazel Grove. Archer was taking measures with a view to forcing a connection with Anderson; while the latter sent Perry by the Catharpen road, and Posey direct, towards the Furnace, with like purpose.