“The orders for the advance of your army, and that its progress be reported daily, are peremptory.
H. W. Halleck.”
The thing required was stupendous, but the results show it was not impossible. Sixty miles from the Union army was the Tennessee River and Cumberland Mountains. Both run from north-east to south-west. There are in these lofty mountain ranges occasional gaps, through which the great east and west traffic of the country takes place. Chattanooga, in 1863 a town of fifteen hundred inhabitants, is in the most important of these gaps—the one through which passes the Tennessee River and an important net-work of railroads. The town is right in the mountains, twenty-five hundred feet above the sea-level, and was strongly fortified, and practically impregnable to assault. Along the north-west front of the town runs the river, which would have to be crossed by the Union forces. On the southern side of the river, below Chattanooga, are three parallel ranges: Sand Mountain, Lookout Mountain, and Pigeon Ridge,—the valleys between the ridges running up to the gap at Chattanooga. North-east of the town the ridges begin again, and the general configuration of the country is similar. Chattanooga was south-east from where the Union army was situated. The town was the lock, and Bragg’s army the key, to the door to Georgia, Virginia, and the Carolinas. To unlock this door was the task before the Army of the Cumberland.
But the problem of Rosecrans’s advance contained other complications beside the deep river, the lofty mountains, and the heavy fortifications. His army had to depend for its supplies upon Louisville, Kentucky, and the slender line of railway from that place. Every advance necessitated the weakening of his army by leaving strong detachments to preserve this communication; while, on the other hand, Bragg, already reinforced, would grow stronger all the time as he fell back on his reserves.
It is reasonable to suppose that the reason Garfield had urged the advance toward Chattanooga was that he saw a way in which it could be made. When the peremptory order came, a plan for the advance was projected, which, though vaster and more complicated than that of the Tullahoma campaign, contains the same elements, and shows itself to have been the work of the same mind. It was, indeed, a continuation of the same campaign. The plan was Rosecrans’s, because he adopted it. It was Garfield’s, because he originated it. The theory of the advance was to pass the enemy’s flank, march to his rear, threaten his line of supplies and compel him, by military strategy, to evacuate Chattanooga, as he had Shelbyville and Tullahoma. The door would thus be unlocked, and Bragg’s army driven from its last fortification to the open country. The details of the plan, as prepared by Garfield, will appear as the advance is explained. On August 16th began the movement of the army across the mountains toward the Tennessee River. The paramount effort in the manner of the advance was to deceive the enemy as to the real intention.
The army made the movement along three separate routes. Crittenden’s corps, forming the left, was to advance by a circuitous route, to a point about fifteen miles south-west of Chattanooga, and make his crossing of the Tennessee River there. Thomas, as our center, was to cross a little farther down stream, and McCook, thirty miles farther to the right. These real movements were to be made under the cover of an apparent one. About seven thousand men marched directly to the river shore, opposite Chattanooga, as if a direct attack were to be made on the place. “The extent of front presented, the show of strength, the vigorous shelling of the city by Wilder’s artillery, the bold expression of the whole movement, constituted a brilliant feint.” Bragg was deceived again. Absorbed in the operations in front of the place, he offered no resistance to the crossing of the Tennessee River by the main army.
By September 3d, the Union forces were all on the southern side of the Tennessee. Sand Mountain, the first of the ridges on that side of the river, rises abruptly from the bank. The repair and construction of roads occupied a little time; but Thomas and McCook pushed forward vigorously, and by the evening of the 6th of September had crossed Sand Mountain, and occupied the valley between it and the Lookout Range. Each of these corps had crossed the range at points opposite their crossings of the river, and, though in the same valley, were thirty-five miles apart. Crittenden, instead of crossing, turned to his left, and marched up the river bank toward Chattanooga, and crossed into the Lookout Valley by a pass near the town. On the 7th the next stage of the movement began, viz: the crossing of Lookout Range, in order to pass to the enemy’s rear, and, by endangering his supplies, compel him to abandon Chattanooga.
As soon as Bragg’s spy-glasses on Lookout Mountain, at Chattanooga, disclosed this movement, the order to evacuate the place was given. Shelbyville and Tullahoma were repeated, and on the morning of September 9th Crittenden marched in and took the place without the discharge of a gun. Strategy had again triumphed. The door was unlocked. The fall of Chattanooga was accomplished. The plan of the campaign had been carried out successfully. The North was electrified. The South utterly discomfited. Of the fall of Chattanooga, which, as we have shown, was but the continuation of the plan of the Tullahoma campaign, and was predicted by Garfield, even to the manner of its accomplishment, in his argument to Rosecrans in favor of an advance, Pollard, the Confederate historian, writes:
“Thus we were maneuvered out of this strategic stronghold. Two-thirds of our niter beds were in this region, and a large proportion of the coal which supplied our foundries. It abounded in the necessaries of life. It was one of the strongest mountain countries in the world; so full of lofty mountains that it has been not inaptly called the Switzerland of America. As the possession of Switzerland opened the door to the invasion of Italy, Germany, and France, so the possession of East Tennessee gave easy access to Virginia, North Carolina, Georgia, and Alabama.”
It is easy to see that behind this masterly strategy there was a masterly strategist. That man was Rosecrans’s chief of staff.