After the battle of Stones River, or Murfreesboro, Tenn., December 31, 1862, to January 2, 1863, the Union Army of the Cumberland, under Maj. Gen. William Rosecrans, and the Confederate Army of Tennessee, commanded by Gen. Braxton Bragg, remained relatively inactive for several months. During this time the Union forces entrenched themselves at Murfreesboro. General Bragg withdrew his forces southward and established his headquarters at Tullahoma. He placed his army in a defensive position to cover the routes, both rail and road, to Chattanooga. Impatient at the inaction, the War Department in Washington urged Rosecrans to move against Bragg’s army. Grant, conducting his Vicksburg campaign, wanted pressure applied against Bragg’s army to prevent all or part of it from reinforcing the Confederates in Mississippi. At the same time Andrew Johnson, Military Governor of Tennessee, reminded the authorities in Washington of the plight of the East Tennesseans. During this period, Maj. Gen. Ambrose E. Burnside gathered a Union force and made plans to invade East Tennessee. Rosecrans hesitated to move. His lack of cavalry was a disadvantage in gathering intelligence and prevented him from countering the Confederate cavalry which harassed him constantly. In June, Maj. Gen. Henry W. Halleck, general in chief, U. S. Army, wired Rosecrans asking him, “Is it your intention to make an immediate movement forward? A definite answer, yes or no, is required.” Rosecrans telegraphed: “In reply to your inquiry, if immediate means tonight or tomorrow, no. If it means as soon as all things are ready, say five days, yes.” On June 24, General Rosecrans put his army of some 60,000 men in motion. _The Tullahoma Campaign_ The Army of the Cumberland—the Union force—had undergone a reorganization since the Battle of Stones River. It now comprised three corps: The Fourteenth, Maj. Gen. George H. Thomas in command; the Twentieth, Maj. Gen. Alexander McD. McCook in command; and the Twenty-first, Maj. Gen. Thomas L. Crittenden in command. Maj. Gen. David S. Stanley commanded the Cavalry Corps. Maj. Gen. Gordon Granger commanded the Reserve Corps. The left wing of General Bragg’s defense line was at Shelbyville under Lt. Gen. Leonidas Polk and its right wing at Wartrace and Fairfield under Lt. Gen. William Hardee—a line nearly 13 miles long. Two Confederate cavalry corps occupied positions on either flank—that on the right at McMinnville under Maj. Gen. Joseph Wheeler, the other on the left at Columbia under Brig. Gen. Nathan B. Forrest. The total strength of the Army of Tennessee was approximately 43,000 men at this time.