The three corps of the Union army, as we have seen, were now separated over a wide extent of territory by intervening ridges, so intent was Rosecrans on intercepting the vanished Bragg. But the latter, by no means vanished, and with his face toward Chattanooga, considered the position of his antagonist and discovered his own army almost opposite the Federal center. Crittenden was advancing toward Ringgold, and the remoteness of Thomas’ corps on his right precluded any immediate union of the Federal forces.
Bragg was quick to grasp the opportunity made by Rosecrans’ division of the army in the face of his opponent. He at once perceived the possibilities of a master-stroke; to crush Thomas’ advanced divisions with an overwhelming force.
The attempt failed, owing to a delay in the attack, which permitted the endangered Baird and Negley to fall back. Bragg then resolved to throw himself upon Crittenden, who had divided his corps. Polk was ordered to advance upon that portion of it at Lee and Gordon’s Mills, but when Bragg came to the front September 13th, expecting to witness the annihilation of the Twenty-first Corps, he found to his bitter disappointment that the bishop-general had made no move and that Crittenden had reunited his divisions and was safe on the west bank of the Chickamauga. Thus his splendid chances of breaking up the Army of the Cumberland were ruined.
When Bragg’s position became known to Rosecrans, great was his haste to effect the concentration of his army. Couriers dashed toward Alpine with orders for McCook to join Thomas with the utmost celerity. The former started at once, shortly after midnight on the 13th, in response to Thomas’s urgent call. It was a real race of life and death, attended by the greatest hardships. Ignorant of the roads, McCook submitted his troops to a most exhausting march, twice up and down the mountain, fifty-seven miles of the most arduous toil, often dragging artillery up by hand and letting it down steep declines by means of ropes. But he closed up with Thomas on the 17th, and the Army of the Cumberland was saved from its desperate peril.
Crittenden’s corps now took position at Lee and Gordon’s Mills on the left bank of Chickamauga Creek, and the Federal troops were all within supporting distance. In the Indian tongue Chickamauga means “The River of Death,” a name strangely prophetic of that gigantic conflict soon to be waged by these hostile forces throughout this beautiful and heretofore peaceful valley.
The Confederate army, its corps under Generals Polk, D. H. Hill, and Buckner, was stationed on the east side of the stream, its right wing below Lee and Gordon’s Mills, and the left extending up the creek toward Lafayette. On the Federal side Thomas was moved to the left, with Crittenden in the center and McCook on the right. Their strength has been estimated at fifty-five to sixty-nine thousand men. On the 18th, Longstreet’s troops were arriving from Virginia, and by the morning of the 19th the greater part of the Confederate army had crossed the Chickamauga. The two mighty armies were now face to face, and none could doubt that the impending struggle would be attended by frightful loss to both sides.
It was Bragg’s intention to send Polk, commanding the right wing, in a flanking movement against the Federal left under Thomas, and thus intervene between it and Chattanooga. The first encounter, at 10 o’clock in the morning of the 19th, resulted in a Confederate repulse, but fresh divisions were constantly pushed forward under the deadly fire of the Federal artillery. The Federals were gradually forced back by the incessant charge of the Confederates; but assailed and assailant fought with such great courage and determination that any decided advantage was withheld from either. Meanwhile, the Federal right was hard pressed by Hood, commanding Longstreet’s corps, and a desperate battle ensued along the entire line. It seemed, however, more like a struggle between separate divisions than the clash of two great armies. When night descended the Federals had been forced back from the creek, but the result had been indecisive.
Disaster to the Union army had been averted by the use of powerful artillery when the infantry seemed unable to withstand the onslaught. Rosecrans had assumed the defensive, and his troops had so far receded as to enable the Confederates to form their lines on all the territory fought over on that day. During the night preparations were made in both camps for a renewal of the battle on the following morning, which was Sunday. A fresh disposition of the troops was made by both leaders. Near midnight General Longstreet arrived on the field, and was once placed in command of the Confederate left, Polk retaining the right. Not all of Longstreet’s troops arrived in time for the battle, but Bragg’s force has been estimated at fifty-one to seventy-one thousand strong.
Thomas was given command of the Union left, with McCook at his right, while Crittenden’s forces occupied the center, but to the rear of both Thomas and McCook. Thomas had spent the night in throwing up breastworks on the brow of Snodgrass Hill, as it was anticipated that the Confederates would concentrate their attack upon his position.
Hostilities began with a general movement of the Confederate right wing in an attempt to flank the Union left. General Bragg had ordered Polk to begin the attack at daybreak, but it was nearly ten o’clock in the morning before Breckinridge’s division, supported by General Cleburne, advanced upon Thomas’ entrenchments. Fighting desperately, the Confederates did not falter under the heavy fire of the Federals, and it seemed as if the latter must be driven from their position. Rosecrans, in response to urgent requests for reënforcements, despatched troops again and again to the aid of Thomas, and the assault was finally repulsed. Cleburne’s division was driven back with heavy loss, and Breckinridge, unable to retain any advantage, was forced to defend his right, which was being seriously menaced. The battle at this point had been desperately waged, both sides exhibiting marked courage and determination. As on the previous day, the Confederates had been the aggressors, but the Federal troops had resisted all attempts to invade their breastworks.