Soon after eight o'clock part of Reilly's brigade got over the swamp and creek under cover of the artillery, uncovering the bridge at the road where the rest crossed; Cameron's was now coming into close co-operation from the east, and a dashing charge by both carried the hill. [Footnote: _Id._, pt. ii. pp. 683, 703, 720.] It was now half-past eight, and the cannonade which preceded the attacks at the centre was opening heavily behind us. [Footnote: _Id._, pt. i. pp. 199, 632.] The captured position was a commanding one, and the view from it covered the whole region from Kennesaw to Lost Mountain. Cameron was left there whilst Reilly followed the retreating enemy with orders to advance as far as he could toward the Marietta and Sandtown road, which was supposed to come into the old Cassville and Sandtown road a mile or two ahead. We now knew from prisoners that the force opposed to us was the division of Confederate cavalry under Jackson, and that they were not closely supported by infantry. The hill had been held by Ross's brigade, which retreated to another eminence half a mile further down the road. Reilly again advanced, supported by Cameron. Ross was again dislodged and retreated upon the rest of the division at the junction of the roads above mentioned. [Footnote: _Id._, pt. iv. pp. 799-801.] As we advanced it became evident that the principal ridge on which Johnston's army was broke down into separate hills as it came forward toward the forks of the main roads, and it seemed feasible to hold some of these in such a way as to make mutually supporting positions from Byrd to Reilly, covering a front of two miles and commanding the lower part of the Nickajack valley, in which the Marietta road ran. Reilly was put in one of these positions with his right across the road on which we had come, two miles south of Cheney's; Cameron was ordered forward upon high ground near Reilly's left, and Byrd was directed to straighten out his line on his right and reach as far as he could toward Cameron. All were ordered to intrench as rapidly and thoroughly as possible, for it was plain that we now commanded a short road to the railway in Johnston's rear, and that he must drive us out or abandon the Kennesaw line he had clung to so stubbornly.