Buell considered Nashville the vital point of the theatre, and was satisfied that it would be the main point of Bragg's attack. He therefore ignored Halleck's elaborate plan and set about repairing the railway to Nashville and moving his troops in that direction. His previous slowness and indecision had brought him greatly into disfavor, and on the 30th of October he was relieved by Major-General William S. Rosecrans. The district was called thereafter the Department of the Cumberland and the army in the field was designated as the Fourteenth Army Corps. Halleck's plans were urged upon Rosecrans, but he was of the same opinion as Buell, and it had by that time become plain that Bragg was doing just what Buell thought he would do. Rosecrans concluded to go on in the same direction as had Buell, and the events showed clearly that Halleck's bureau-made plans, based upon theory alone and without an intimate knowledge of the real conditions, were the veriest nonsense, and that Buell and Rosecrans were quite right in ignoring them. Rosecrans organized the army into right wing, center, and left wing. The right wing, under McCook, consisted of Johnson's, Davis's, and Sheridan's divisions. Thomas commanded the center, which consisted of five divisions under Rousseau, Negley, Fry, Mitchell, and Reynolds. The left wing was commanded by Crittenden, and comprised Wood's, Palmer's, and Van Cleve's divisions. The total available strength of the army formed not more than 60 per cent. of its paper strength, owing to absenteeism. Every endeavor was made to remedy this state of affairs, a condition not peculiar to this army alone, but affecting all the armies almost equally, and constituting a serious evil, for the correction of which severe measures were an absolute necessity. The army was very deficient in cavalry, and a large portion of its meagre force was very poorly armed. In this condition the army was at a great disadvantage opposed to Bragg, whose cavalry, under Forrest, Morgan, and Wheeler was much greater in numbers and better mounted and equipped. Rosecrans made strenuous efforts to improve the condition of his cavalry, and succeeded in increasing it to about 4,000 and in obtaining Stanley to command it. But at its greatest strength it was less than half the opposing cavalry force. Rosecrans' future base of operations was Nashville, but he would be dependent for supplies upon the maintenance of the railroad to Louisville. He hastened to increase the garrison of Nashville, but could not for some time concentrate there owing to the destruction of a railway tunnel near Mitchellsville, which limited him to wagon transportation over bad roads for thirty-five miles. The railway was opened November 26th, and the army was then concentrated near Nashville, with the exception of Reynolds' division and all but one brigade of Fry's, which were assigned the duty of protecting the railway.