He found the army half starved for lack of routes of communication with its bases of supply. He instantly set his men at work to open a new road which the facetious soldiers named the "cracker line," and which connected Chattanooga with a point on the river to which steamboats could come with abundant supplies. This relieved the Federal army in Chattanooga of its condition as an army in a state of siege. It made of it instead an army in the field, well fed, properly supplied, and ready for march or battle, as its commander might direct. Having thus relieved the distresses of the army he had been sent to command, Grant's next thought was to employ that army in some profitable way. The Confederates, strongly fortified, held Lookout mountain and Missionary Ridge, and stretched their line for twelve miles across the Chattanooga valley. Grant decided to dislodge them. He could not do so with the forces assembled at Chattanooga, but at last the authorities at Washington had recognized him as a man worthy to command, and had placed the entire department under his control, and all its armies were at his disposal. Grant believed in Sherman, and mightily trusted him. At every point in his career where Sherman could be called to his aid Grant summoned that commander, and employed his genius as the most effective instrument for the accomplishment of his own purposes. It is not too much to say that Sherman was to Grant quite all that Stonewall Jackson was to Lee--a lieutenant to whom he might assign the most difficult enterprises with full assurance that they would be executed with all the skill, determination, valor and sagacity that it was possible to bring to bear upon them as military operations. So when Grant determined to dislodge the Confederates from Lookout mountain and Missionary Ridge his first step was to summon Sherman to join him with the corps then under Sherman's command. Certain military necessities delayed Sherman's march, and he did not reach the position at Chattanooga until the fifteenth of November. His arrival swelled Grant's force to about 80,000 men, while Bragg's army was weakened by the detachment of Longstreet with 20,000 men to operate against Burnside, who was commanding at Knoxville, Tennessee. The Confederate force in possession of Lookout mountain and Missionary Ridge was thus considerably inferior to the army with which Grant prepared to assail it. But the Confederates were strongly posted and on a part of their line, at least, they were well entrenched.