During the winter, after the Chattanooga victory, General Grant made his headquarters at Nashville, and devoted himself to acquiring an intimate knowledge of the condition of the large region now under his command, to the reorganization of his own lines of transportation, and the destruction of those of the enemy. He made a perilous journey to Knoxville in the dead of winter, and a brief trip to St. Louis, on account of the dangerous illness of his son there. On this trip he wore citizen's clothes, traveled as quietly as possible, declined all public honors, and made no delays. The whole route might have been a continuous enthusiastic ovation; but he would not have it so. His work was not done, and he sternly discountenanced all premature glorification. Too many generals had fallen from a high estate in the popular judgment, for him to court a similar fate. The promotions that gave him greater opportunity of service he accepted; but he preferred to keep his capital of popularity, whatever it might be, on deposit and accumulating while he stuck to his unaccomplished task, instead of drawing upon it as he went along for purposes of vanity and display. Of vulgar vanity he had as little as any soldier in the army. Nashville was the base of supplies for all the operations in his military division. Its lines of transportation had been worn out and broken down, largely through incompetent management. He put them in charge of new men, who reconstructed and equipped them. While engaged in this necessary work he dispatched Sherman on an expedition through Mississippi, which he hoped would reach Mobile; but it terminated at Meriden, through failure of a cavalry force to join it. But it did a work in destruction of railroads and railroad property, that inflicted immense damage on the Confederacy. Throughout the winter Grant worked as if his reputation was yet to be made, and to be made in that military division. Meanwhile Congress and the country were pondering his deserts, and his ability for still greater responsibilities. The result of this deliberation was the passage of the act, approved March 1, 1864, reestablishing the grade of lieutenant-general in the regular army. The next day President Lincoln nominated General Grant to the rank, and the nomination was promptly confirmed. He was ordered to Washington to receive the supreme commission. It was his first visit to the national capital; his first personal introduction to the President, although he had heard him make a speech many years before; his first meeting with the leading men in civil official life, who were sustaining the armies and guiding the nation in its imperiled way. He came crowned with the glory of victories second in magnitude and significance to none, since Wellington defeated Napoleon at Waterloo. Everybody desired to see him, and to honor him.