...anticipated, and time was now of priceless value. Meanwhile the movement, though misunderstood, had been detected by the enemy. About a mile southwest of Chancellorsville was a settlement called Hazel Grove , on a cleared ridge. From this ridge, about 8 A. M., Birney, of Sickles's corps, discovered a column of infantry, trains, and artillery passing his front. He brought up a battery and opened on th...