Six weeks of unavoidable delay occurred, during which time the Army of the Ohio did nothing to retrieve its past disasters. General Rosecrans was one hundred and eighty-three miles from Louisville, his base of supplies; and the only communication between his present headquarters and the capital of Kentucky was a single line of railroad, not yet completed from Mitchellsville to Nashville, a distance of fifty miles. The completion of this piece of railroad occupied three weeks; and after it was in perfect running order, it required still another three weeks to collect supplies, sufficient to make it safe for the army to attempt any movement in advance. Much skirmishing between the patriot troops and the rebels meanwhile occurred; in most of which the former were victorious. The only disaster of any moment, that occurred to the Union army, at this period, was the capture of Colonel Moore’s brigade, at Hartsville, by the rebel guerrilla, General John A. Morgan, with a cavalry force, and mounted infantry, numbering about five thousand men. General Rosecrans proceeded with indefatigable energy in his preparations to meet the enemy; but, with the utmost dispatch and patience combined, it was almost the end of December before he was in condition to offer battle to the rebel Bragg, who was stationed at Murfreesboro’, having made his headquarters there, after his escape from Kentucky. The army under General Rosecrans bore no comparison in numbers with that of Bragg; but its organization was perfect. Being compelled to leave a large force at Nashville, for the protection of that city, General Rosecrans’ force, when he advanced, was less than forty-seven thousand men; while that of General Bragg numbered sixty-five thousand. General Rosecrans divided his army into three corps; one under command of General McD. McCook; another under command of General George H. Thomas; and a third under command of General Thomas L. Crittenden. The corps of General McCook consisted of three divisions under Generals Johnson, Davis and Sheridan; General Thomas’ corps consisted of two divisions, under Generals Rousseau and Negley. The corps of General Crittenden was composed of three divisions, under Generals Van Cleve, Wood and Palmer. General D. S. Stanley was chief of cavalry. The rebel forces under Bragg were also divided into three corps, commanded respectively by Generals Hardee, Polk and E. Kirby Smith. In addition General Bragg had two cavalry brigades, under command of General Forrest and General Morgan; each of these brigades contained five thousand men. The moment for attack had come, in the judgment of General Rosecrans. The rebel cavalry force had been sent north, on a raid, in consequence of incorrect information received by Bragg, concerning the movements of Rosecrans.