On beginning the movement to Morristown, orders had been given to press the rebuilding of the railroad bridge at Strawberry Plains, for our continuance so far from our supplies depended upon it. We had no trains of wagons to keep up our communication with our base, and the utmost we could do was to carry four or five days' supply with us. We therefore spent three or four days in vigorous efforts to gain information of the enemy by means of our cavalry. We learned that Longstreet held the line of Bays Mountain, where the railway passes through Bull's Gap, thirteen miles above Morristown. His right flank seemed to be at Rogersville on the Holston, and his left rested near the Nolachucky beyond Greeneville. We could not learn that any of his forces except Martin's cavalry had left him, though we were mystified by the disappearance of Ransom's division from the accounts of the enemy's organization. The fact was that that officer was transferred to the cavalry command, and the organization of his division was merged in the others. On the 2d of March Grant directed that McCook's division of cavalry should go back to Thomas as soon as they could possibly be spared, and on Schofield's reporting the results of our reconnoissances, he advised the latter not to bring on an engagement, but to content ourselves with holding as much of the country as we could. [Footnote: Official Records, vol. xxxii. pt. iii. p. 14.] The bill creating the grade of lieutenant-general was now the law, and Grant had been promoted to it. On the invitation of the President he was about to go to Washington for consultation, keeping in telegraphic communication with his department commanders. [Footnote: _Id_., p. 17.] Consequently it agreed well with his views to let affairs remain quiet during his absence. The rains continued, however, and even if he had desired further advance it would have been out of the question till the bridge at Strawberry Plains was rebuilt. The rations brought with us were exhausted, and on the 4th we withdrew the infantry fourteen miles, to a position four miles above New Market, where we hoped to be able to feed the troops with our few wagons, until the railroad should again be available. Headquarters in the field were established at New Market, and I remained there with authority to direct and support the cavalry movements actively kept up in our front. General Schofield was thus enabled to spend part of his time at Knoxville attending to the clothing and supply of the troops, the gathering of reinforcements, return of veterans, and all the matters of department administration which centred there. In case of the necessity of combined action in Grant's absence, Thomas was authorized to assume command.