When we passed Cleveland, the Fourth Corps took up its line of march, bearing away to the westward of ours and went into position at Catoosa Springs, about eight miles southwest of Red Clay, with a ridge intervening. Here General Howard became the left of the Army of the Cumberland, having Palmer's Corps (the Fourteenth), next beyond him facing Tunnel Hill, and Hooker's (the Twentieth) still farther to the southwest, marching by way of Woods Station over Taylor's Ridge upon Trickum in the upper valley of the East Chickamauga. Thomas's army was the heavy centre of the grand army, and his infantry was about two-thirds of the whole. This great preponderance of one organization was faulty in a purely military point of view, but Grant and Sherman both felt that it would not be wise to disturb the _esprit de corps_ of the Cumberland Army by subdividing it, or to offend Thomas by diminishing it, and, anyhow, no such change could have been made without the concurrence of the President. General McPherson's Army of the Tennessee was to constitute Sherman's right, but was a little delayed in its concentration. At this time it contained only Logan's Corps (the Fifteenth) and the left wing of the Sixteenth (Brigadier-General G. M. Dodge in command). It was moving behind the Army of the Cumberland, to Lee and Gordon's Mills, and thence upon Villanow. [Footnote: Official Records, vol. xxxviii. pt. iv. p. 39.] General Kenner Garrard's strong division of cavalry accompanied McPherson's movement. Sherman was anxious to allow the enemy as little time for preparation as might be, yet, as he had to give McPherson a day or two to come into line, he set Saturday the 7th of May as the time for the more complete concentration, and an attack upon Tunnel Hill if Johnston should continue to hold it. [Footnote: _Id_., p. 38.] Accordingly, on Saturday morning all the columns were in motion. Palmer advanced against the ridge of Tunnel Hill in front, and Howard coming from the north turned the flank of the ridge. The hill was held by the Confederate cavalry under Wheeler, supported by Stewart's division of infantry, who were ordered to resist our advance with stubbornness enough to force the display of Thomas's forces. [Footnote: _Id_., p. 672.] A lively skirmishing fight was kept up till Howard's men advanced toward the flank and rear of the position, when the enemy retreated within Mill Creek Gap. Wheeler was ordered to let a brigade of cavalry retire up the valley of Mill Creek, outside of Rocky Face, and to cover Dug Gap, through which runs the road from Villanow to Dalton. [Footnote: _Ibid_.]