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"On February 5, 1863, Sedgwick was assigned command of VI Corps, and was succeeded by Maj. Gen. William F. “Baldy” Smith, and on February 12 the corps was ordered to Newport News, where it encamped for a month. General Smith's stay with the corps was of short duration, for he was succeeded in the following month by Maj. Gen. John G. Parke. While at Newport News, Getty's (3rd) Division was detached and ordered to Suffolk, Virginia, where it was subsequently incorporated into the VII Corps. It never rejoined its old command although, in 1864, one of its regiments, the 4th Rhode Island, was restored to the IX Corps.
In the meantime, General Burnside had been assigned to the command of the Department of Ohio, a district that included Kentucky and eastern Tennessee. He obtained permission for the transfer of his old corps to this field of operations, and on March 19, 1863, General Parke was ordered to proceed there with his two remaining divisions, Willcox's and Sturgis's. Just prior to the departure from Virginia, General Sturgis was relieved, and Brig. Gen. Robert B. Potter was assigned to the command of the 2nd Division. The IX Corps was stationed in Kentucky for two months, during which it served as an army of occupation. In June it was ordered to the support of Ulysses S. Grant, who was then besieging Vicksburg, and proceeding there promptly, it participated in the investment of the city, although not under fire. Upon the surrender of Vicksburg, Parke's two divisions joined the main army in its movement on Jackson, Mississippi, and became engaged in the fighting there, with a loss of 34 killed, 229 wounded, and 28 missing; total, 291. The 1st Division was then under command of Brig. Gen. Thomas Welsh, General Willcox having been assigned to duty in Indiana. The Vicksburg Campaign had been a costly one for the Corps, not due to battle casualties, but to disease. Among those who succumbed to the deadly malaria of the Vicksburg camps was General Welsh, who, soon after, went home to die.
The corps left Mississippi in August, 1863, and returned to Kentucky, where, after a short rest, it joined in Burnside's advance into East Tennessee, a movement that had already commenced. The two divisions were now reduced to about 6,000 men. General Parke having been made chief of staff of the Army of the Ohio, General Potter succeeded to the command of the corps, with Brig. Gen. Edward Ferrero and Col. John F. Hartranft in command of the two divisions.
Ferrero's Division had a sharp little fight at Blue Springs, Tennessee, October 10, 1863, and the whole corps was engaged, November 16, at Campbell's Station. This was followed by the occupation of Knoxville and the gallant defense against James Longstreet's besieging forces, terminating December 4, in the defeat and withdrawal of the enemy."
Text of the marker:
U (shield) S
Headquarters 9th Corps
Army of the Tennessee
Maj. Gen. John G. Parke
Near Milldale from June 18 to June 29 and
on Oak Ridge from that date to July 4 1863