longstreet's attack commenced with a 30-minute artillery barrage by 36 guns that was particularly punishing to the union infantry in the peach orchard and the troops and batteries on houck's ridge. maj. gen. john bell hood's division deployed in biesecker's woods on warfield ridge (the southern extension of seminary ridge) in two lines of two brigades each: at the left front, brig. gen. jerome b. robertson's texas brigade (hood's old unit); right front, brig. gen. evander m. law; left rear, brig. gen. george t. anderson; right rear, brig. gen. henry l. benning.