French's division of Couch's corps was posted on Berry's right, the other division (that of Hancock) remained between Mott Run and Chancellorsville.
When the movement began, Birney's division, on the left of Whipple's, occupied the high ground at Hazel Grove, facing the Plank Road, Graham's brigade being on the extreme left.

This was a very aggressive position, since it took every column that advanced against Sickles' new line directly in flank, and therefore it was indispensable for the rebel commander to capture Hazel Grove before he advanced against the main body of the Third Corps, which held the Plank Road.

This hill was not quite so high as that at Fairview, but our artillery on it had great range, and the post should have been maintained at all hazards.

The cavalry who had so ably defended it fell back, in obedience to orders, to the Chancellorsville House, to support the batteries in that vicinity, and I think one regiment was sent to report to Sedgwick.

Whipple commenced the movement by sending off his artillery and that of Birney.