...ard Salem, and was ready to fall on Hunter's right flank and co-operate with Early's pursuit, on the 21st, to Big Lick, and then across to Hanging Rock, a gap in the North mountains, on the Salem and Sweet Springs turnpike . There it struck the flank of Hunter's retreat, which had been expedited by Imboden's cavalry, which had marched to the left and crossed the Blue ridge southwest of Buford's gap and fallen upon Hun...