Such, undoubtedly, would have been its fate had not General Thomas and his brave troops covered the retreat, by holding the whole Confederate army in check for hours and even forcing it to yield portions of the bloody field. From that day forward Thomas was known as "The Rock of Chickamauga," but the heroic stand of his gallant men barely sufficed to save the Union army, which reached the intrenchments of Chattanooga only just in time, with the Confederates hot upon its trail.

Had Bragg overtaken his flying opponent, he would doubtless have made an end of him then and there, but it was not altogether with regret that he saw him enter Chattanooga, for with the roads properly blocked he knew the place would prove a perfect trap. He, accordingly, began a close siege which instantly cut off all Rosecrans' communication with the outside world, except by one road which was in such a wretched condition as to be impossible for a retreating army. Indeed, the heavy autumn rains soon rendered it impracticable even for provision wagons, and as no supplies could reach the army by any other route, it was not long before starvation began to stare the besieged garrison in the face.

Meanwhile, Rosecrans, almost wild with anxiety and mortification, sent dispatch after dispatch to Washington describing his condition and imploring aid, but though he still had an effective army under his command and plenty of ammunition, he made no attempt whatever to save himself from his impending doom. Day by day the situation grew more and more perilous; thousands upon thousands of horses and mules died for lack of food and the men were so nearly reduced to starvation that they greedily devoured the dry corn intended for the animals.

All this time the authorities in Washington were straining every nerve to rescue the beleaguered army. Sixteen thousand men under General Hooker were rushed to its relief, provisions were forwarded within a day's march of the town, awaiting the opening of new roads, and finally, when the stream of frantic telegrams from the front showed that the army had practically no leadership, hurried orders were forwarded to Grant, authorizing him to remove Rosecrans, place Thomas temporarily in control and take the field himself at the earliest possible moment.

This unexpected summons found Grant in a serious condition, for some weeks earlier his horse had fallen under him, crushing his leg so severely that for a time it was feared he might be crippled for life, and he was still on crutches suffering intense pain when the exciting orders were placed in his hands. Nevertheless, he promptly started on his desperate errand, traveling at first by rail and steamer and then in an ambulance, until its jolting motion became unbearable when he had himself lifted into the saddle with the grim determination of riding the remainder of the way. Even for a man in perfect physical condition the journey would have been distressing, for the roads, poor at their best, were knee deep in mud and a wild storm of wind and rain was raging. Time and again his escort had to lift the General from his horse and carry him across dangerous washouts and unaffordable streams, but at the earliest possible moment they were always ordered to swing him into the saddle again.

Thus, mile after mile and hour after hour, the little cavalcade crept toward Chattanooga, Grant's face becoming more haggard and furrowed with pain at every step, but showing a fixed determination to reach his goal at any cost. On every side signs of the desperate plight of the besieged garrison were only too apparent. Thousands of carcasses of starved horses and mules lay beside the road amid broken-down wagons, abandoned provisions and all the wreckage of a disorganized and demoralized army.

But if the suffering officer noted these ominous evidences of disaster, his face afforded no expression of his thought. Plastered with mud and drenched to the skin, he rode steadily forward, speaking no word and scarcely glancing to the right or left, and when at last the excruciating journey came to an end, he hastened to interview Thomas and hear his report, without even waiting to change his clothes or obtain refreshment of any kind.

It was not a very cheerful story which Thomas confided to his Chief before the blazing headquarters' fire, but the dripping and exhausted General listened to it with no indication of discouragement or dismay. "What efforts have been made to open up other roads for provisioning the army?" was the first question, and Thomas showed him a plan which he and Rosecrans had worked out. Grant considered it in silence for a moment and then nodded his approval. The only thing wrong with the plan was that it had not been carried out, was his comment, and after a personal inspection of the lines he gave the necessary authority for putting it into immediate operation. Orders accordingly began flying right and left, and within twenty-four hours the army was busily engaged in gnawing a way out of the trap.

Additional roads were essential for safety but to gain them the Confederates had to be attacked and a heavy force was therefore ordered to seize and hold a point known as Brown's Ferry. This relieved the situation at once and meanwhile the new commander had hurried a special messenger to Sherman, ordering him to drop everything else and march his Vicksburg veterans toward Chattanooga without an instant's delay. The advance of this strong reënforcement was promptly reported to Bragg, who saw at a glance that unless it could be stopped there was every prospect that his Chattanooga victims would escape.

He accordingly determined upon a very bold but very dangerous move. Not far away lay General Burnside and a small Union army, guarding the important city of Knoxville, Tennessee, and against this the Confederate commander dispatched a heavy force, in the hope that Grant would be compelled to send Sherman to the rescue.