and scattered with huge rocks to approach the Missouri brigade of Brig. Gen. Francis Cockrell. Some of the troops were able to reach as far as the abatis, but most were not and they were forced to remain stationary, firing behind trees and rocks. When General Logan rode forward to judge their progress, he determined that many of his men were being "uselessly slain" and ordered Walcutt and Smith to withdraw and entrench behind the gorge that separated the lines. About to the south, Thomas's troops were behind schedule, but began their main attack against Hardee's corps at 9 a.m. Two divisions of the Army of the Cumberland—about 9,000 men under Brig. Gen. John Newton (Maj. Gen. Oliver O. Howard's IV Corps) and Brig. Gen. Jefferson C. Davis (Maj. Gen. John M. Palmer's XIV Corps)—advanced in column formation rather than the typical broad line of battle against the Confederate divisions of Maj. Gens. Benjamin F. Cheatham and Patrick R. Cleburne, entrenched on what is now known as "Cheatham Hill." On Newton's left, his brigade under Brig. Gen. George D. Wagner attacked through dense undergrowth, but was unable to break through the abatis and fierce rifle fire. On his right, the brigade of Brig. Gen. Charles G. Harker charged the Tennessee brigade of Brig. Gen. Alfred Vaughan and was repulsed. During a second charge, Harker was mortally wounded. Davis's division, to the right of Newton's, also advanced in column formation. While such a movement offered the opportunity for a quick breakthrough by massing power against a narrow point, it also had the disadvantage of offering a large concentrated target to enemy guns. Their orders were to advance silently, capture the works, and then cheer to give a signal to the reserve divisions to move forward to secure the railroad and cut the Confederate army in two. Col. Daniel McCook's brigade advanced down a slope to a creek and then crossed a wheat field to ascend the slope of Cheatham Hill. When they reached within a few yards of the Confederate works, the line halted, crouched, and began firing. But the Confederate counter fire was too strong and McCook's brigade lost two commanders (McCook and his replacement, Col. Oscar F. Harmon), nearly all of its field officers, and a third of its men. McCook was killed on the Confederate parapet as he slashed with his sword and shouted "Surrender, you traitors!" Col.