Pardee went west with the rest of XII Corps and XI Corps, which had been sent to the relief of the Army of the Cumberland, besieged in Chattanooga, Tennessee by the Confederate Army of Tennessee. The regiment participated in the Battle of Wauhatchie, the Battle of Lookout Mountain and the Battle of Ringgold Gap while under the overall command of Maj. Gen. Joseph Hooker. Pardee, ordinarily a critic of Geary, praised his division commander's conduct at Wauhatchie.