Cameron was over Byrd's bridge at four o'clock, and was ordered upon reaching the ridge in rear of Byrd to push boldly along it toward the fortified hill the other side of the Sandtown road in front of Reilly. Byrd's orders were to hold his position with the main body of his brigade, but to throw out detachments and skirmishers in all directions to watch the enemy and to get information of the country. Leaving Cameron as soon as he was well on his way, I rode to Reilly in front of the Cheney farm, and found that at five his dispositions for forcing the passage of the stream were well under way. He had determined to try it some distance below the bridge, at a place where, though the banks were swampy, the creek was fordable, and the hills behind gave good opportunity to use the artillery and put the men across under shelter. My chief of artillery, Major Wells, was with him, selecting places for the batteries and getting them in position. Soon after six I was with Cameron again, and before eight was back at Reilly's position, urging each to all the speed which the strong skirmishing opposition would permit. [Footnote: Official Records, vol. xxxviii. pt. iv. p. 619.] As it was necessary to pass from one position to the other by way of the roads at the rear, it made hard riding for one who wished to be as much as possible with the active heads of columns.

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.