Wilder's cannonading produced the wildest excitement in Chattanooga. The rolling-stock of the railroads was hastened out of reach. The depots of supplies were moved out of the range of the unexpected bombardment. D. H. Hill's corps was hurried off to guard the river above, and other heavy forces were moved in the same direction. Everything done by Bragg was based upon the idea that Rosecrans was moving in force to points on the river above the city.
Meantime the real movement was going on quietly sixty to eighty miles in the opposite direction, in the vicinity of Bridgeport and Stevenson. A force of cavalry for the purposes of observation, and to convey the idea by quick movements that Rosecrans was feigning below, while really expecting to cross above the city, was sent as far westward as Decatur. Thus Rosecrans was operating along the river through a hundred miles of mountain region and fifty miles of low country beyond, and in spite of the natural difficulties every part of the plan was working with precision.
Thomas and McCook on the right moved at the same time with Crittenden. Reynolds, of Thomas's corps, had marched in advance and repaired the roads by way of University, and down the eastern slope of the mountain to Jasper. Brannan followed him, and both were at first kept well out of sight of the river. Baird and Negley came down nearer to Bridgeport, and McCook descended back of Stevenson. With the exception of Sheridan, at Bridgeport, all were kept well out of sight from the enemy's cavalry on the left bank.
Sheridan alone made a show of his presence and openly began the construction of a trestle through the shoal water, in order to lessen the length of the floating bridge. As this was without a decided show of strength it deepened the impression that the movements on this wing were the feint and those toward the upper river the real move. In fact, after watching Sheridan's trestle building for a while from the other side of the river, Anderson's brigade of infantry, the only infantry force available to oppose a passage of the river, was withdrawn and sent to Chattanooga.
The bridge for Caperton's Ferry was brought down on a train, which was halted out of sight, and a road cut for its transportation through the woods to a point near its destination, where the troops which were to lay it were drilled in their work.
Early on the 29th fifty boats, each carrying fifty men, were brought out of the woods near Caperton's, rushed across an open field, launched, and quickly rowed to the opposite shore. The Confederate cavalry pickets were driven off and twenty-five hundred men held the south bank. The bridge was promptly laid. Davis was soon over, and then McCook's entire corps, with cavalry, started promptly for Valley Head, forty miles down the Lookout range. Reynolds collected boats at Shellmound, Brannan had built rafts and cut out canoes at the mouth of Battle Creek. The long bridge was successfully laid at Bridgeport, and before Bragg had recovered from his surprise, in fact before he had comprehended the extent of the movement, Rosecrans, with two corps, was over the river and moving on his communications.
As soon as the crossing was assured, Crittenden marched with celerity by way of the Sequatchee Valley towards the bridges and was soon across with the main body and advancing on the left of it directly towards Chattanooga.
This crossing of the Tennessee was a great feat. The bridges were not sufficient for the army. Reynolds gathered small boats and improvised his own means of crossing. Brannan's men had cut out canoes from immense poplars and launched them in Battle Creek out of sight. Some of them would hold fifty men. They also built rafts, one of them large enough to carry artillery. These, with an abandoned rebel pontoon boat, constituted Brannan's flotilla. When the signal was given the whole swept out from behind the bushes which concealed the mouth of Battle Creek and made for the opposite shore. The rebel pickets withdrew and the crossing was secured. Then all his men who could swim, piling their guns, clothing, and accouterments on a few fence rails, pushed these before them and thus gained the opposite bank. Later, Wilder swam his mounted brigade across the river and joined Crittenden south of Chattanooga. Halleck must have had this ability for crossing a river in the presence of an enemy in mind when he telegraphed Rosecrans, a few weeks before, to move at once and keep moving.
But this crossing, and the grand diversion which made it possible, were only the preliminary, and by no means the formidable parts of the movement. To complete it, Rosecrans was to cut loose from his base, carry twenty-five day's supplies and sufficient ammunition for two battles, cross two precipitous and difficult mountain ranges wholly within the enemy's territory, and their passes presumably strengthened and defended, and, after crossing the last range at widely separated points, to descend into the valley in the rear of that enemy's stronghold, prepared for battle or any other contingencies which might arise on this distant and isolated theater of action.
When Bragg discovered the real point of crossing and the lines of actual movement it was too late to recall the forces dispatched up the Tennessee or to post columns of sufficient strength on the slopes before Rosecrans to impede his advance in force. How strong the positions thus turned by the Union forces were will appear from the statement that so precipitous and otherwise difficult were the roads over these ranges that at several of them it required a day and a night for a division with its artillery and reduced trains to make the ascent.
The Union commander had delayed his movement until the corn was ripe in order that it might not be necessary to carry grain for his animals, which would have largely increased his trains – so careful, thoughtful, and wise was he in every detail of preparation.
Bragg's failure to resist in the vicinity of Rosecrans's crossings and at the crossings of Raccoon Mountain was due in part to the fact that even after he knew that the heads of columns were over the river he was still inclined to look upon their movements as a feint, and to regard the real point of danger to lie above the city. Rosecrans, even after crossing, sought successfully to strengthen such impressions in Bragg's mind. He directed Wagner's, Wilder's, and Minty's brigades to report to Hazen, and with this force, some 7,000 strong, the latter was ordered to make a conspicuous show of crossing the river far above Chattanooga. This active and efficient officer admirably executed his orders. By extended fires, by marchings and countermarchings, by moving his artillery continuously across openings in sight from the opposite bank, by buglers at widely separated points, and other similar devices, he easily created the belief that an army was encamped on the right bank intending to cross.
With the exception of this force, all of Rosecrans's army was south of the river on September 4, and on the move. The right was already well on its way. On the 6th his army had descended from Raccoon Mountain and occupied the valley between that range and the western slope of Lookout from a point seven miles from Chattanooga to Valley Head, forty-two miles from the city. The next day McCook and Thomas began to ascend Lookout at points respectively forty-two and twenty-six miles from Chattanooga. On the 8th McCook's troops were in motion down the eastern slope of the mountain toward Alpine, and Thomas was descending from Steven's and Frick's Gap, both of which were near where the road from Trenton, after running southwardly, is represented as leading over Lookout. Crittenden had pushed small portions of his command up mere mountain trails, and on the 9th these gained position where they could look down upon Chattanooga. They saw no flags, and soon discovered that Bragg had evacuated. The day before Wagner, still watching from the north bank of the river, had reported to Rosecrans that the enemy was leaving. The news came in the night, and Rosecrans ordered Crittenden to ascertain the situation. His detachments on the mountain had already discovered that the city was deserted. Crittenden was at once ordered to march around the north point of Lookout, and follow Bragg toward Ringgold. At night on the 9th Palmer and Van Cleve's divisions were established at Rossville, five miles south of Chattanooga.
Thus, in three weeks from the time his diversion towards Bragg's right began, and in five days from the time his army was over the river, Rosecrans had repeated the Tullahoma campaign on a far greater scale, and in the face of much more formidable obstacles, and absolutely without fighting, except as Minty had been slightly engaged with Dibrell near Sparta in the outset of the movement, had driven Bragg from the mountain stronghold of Chattanooga, the objective of the campaign. It was well said later by General Meigs, who came from Washington to Chattanooga after its final occupation by the Union army, and spent some days in studying
