Sunday morning dawned with a heavy fog filling the valleys—a fog so dense that the mountains were shut out, giving the battle-ground, from every point of view, the appearance of a ghostly plain. This fog did not begin to lift until nine or ten o'clock. Bragg had given Polk orders to begin the battle, but minute after minute passed and the Confederate leader sat impatiently astride of his horse, waiting in vain for the sounds of the conflict.

"What is the matter with Polk,—why in common sense doesn't he do something?" General Bragg is reported to have said, and started off for the right wing personally. He found Polk absent from the field and no preparations being made to attack Baird. As the fog lifted, he saw how his right overlapped the Union left, and how the Rossville road was thus left open, and Breckinridge and Cleburn were given orders to advance without delay.

In the meantime Thomas had ordered Negley to reënforce Baird. But only one division could be spared, which was rushed to the scene with all possible speed, and that was all the support the left flank received.

At half past nine the battle was on, Breckinridge and Cleburn coming swiftly onward with a ringing yell, to meet a sturdy resistance from Baird and Beatty's division of Negley's brigade. The contest was fierce from the very opening, and for a while it looked as if the left flank would be completely annihilated and Baird's command made prisoners. But regiments and divisions under Johnson, Stanley, and Vandever were hurried to the scene, and, suffering heavily, Breckinridge was thrown back, with two generals killed and his chief of artillery mortally wounded.

By this time the battle had extended down the line, and now Cleburn, Walker, Cheatham, and others became involved. The artillery on both sides were pouring forth shot, shell, and canister at a fearful rate, and whole lines of brave infantry were mowed down like blades of grass.

With the repulse of the Confederates' right the hopes of the Unionists ran high, but when victory seemed almost assured, a grave blunder at the Union centre brought fearful disaster to the Army of the Cumberland. Receiving an order to close up to Reynolds, Wood took it to mean that he was to fall back in support, and he left the Union centre to do this. The gap was quickly filled by Longstreet, and thus the right and left wings of the Army of the Cumberland became separated, and henceforth two battles ensued instead of one, on ground from a half a mile to one mile apart. To the east of Kelley's Farm and the Lafayette road were Baird, Johnson, Palmer, and Reynolds, still in their old semicircle, while to the westward of the road was a jagged, but unbroken, line composed of nearly all the other troops. The Confederate forces lay scattered in several directions, but principally in front of both of the positions mentioned.

The disaster to the centre, followed by a determined attack on the right, was more than the Union troops could bear, and they were forced to give up ground, until another stand was taken, as described above. In the meantime, Thomas was in ignorance of the state of affairs on the right, yet he soon discovered that he was fighting more than his share of the enemy on the left. He had massed his artillery on the slopes of Missionary Ridge, and now he withdrew from his breastworks of trees and dirt, and took up a position here. To get to the ridge was no easy work, and the slaughter counted up into the thousands upon both sides.

A pause in the tide of battle followed. Like two giants the armies faced each other, getting their "second wind," and speculating on how to proceed next. Thomas held the ridge and the Confederates were bound to drive him from it and shatter his forces. It was two o'clock and assault after assault was made, lasting until sundown. At times the Confederates would gain a slope or a minor ridge, but a Union division or a brigade would rush upon them and dislodge them, or a battery would literally cut them to pieces. The charges were truly magnificent, but Thomas and his forces stood like so many rocks, and could not be dislodged. At sundown the attacks ceased, and it was well that this was so, for many of the Union troops were short of ammunition. In some cases the latter attacks were repulsed solely with bayonets and clubbed muskets.

With the coming of night, it was deemed advisable to have Thomas's forces withdraw in the direction of Chattanooga, and this plan was carried out, although not without additional fighting, in which a few men were lost and a large number of infantry were made prisoners. By this movement the Army of the Cumberland was again reunited, and stood once more as a wall between General Bragg and Chattanooga.

When Major Deck Lyon awoke in the morning he found the encampment of the Riverlawns submerged in mist so thick it almost appeared as if it was raining. Major Tom Belthorpe and Captain Artie Lyon were already astir, and the three gathered together, to talk over the situation.