General Thomas was still a mile away. In ten minutes Garfield was at his side, hurriedly explaining the catastrophe at noon. They stood on a knoll overlooking the field of battle. The horse which had borne Garfield on his memorable ride, dropped dead at his feet while the chief of staff told Thomas the situation. There was no time to be lost. Hurrying down to his right, General Thomas found that a considerable portion of the center had swung around like a door to oppose Longstreet’s advance. For an hour or more his columns had flung themselves with desperate fury on this line so unexpectedly opposed to them. Hour after hour these lines had held him at bay. The slaughter was terrible. But this could not last. There was no uniform plan in this accidental battle front. There were great chasms in it. The Confederate forces were diverging to their left toward the Dry Valley road, and would soon flank this line. But Thomas was a great commander. Without a moment’s delay his line of battle was withdrawn to a ridge in the form of a horse-shoe. The main front was now at right angles with that of the morning; that is, it lay across the Rossville road instead of parallel with it. Thomas’s troops were now arranged in a three-quarter circle. They scarcely numbered twenty-five thousand. Around this circle, as around a little island, like an ocean of fire, raged a Confederate army of sixty thousand troops. Overwhelmed by numbers, General Thomas still held the horse-shoe ridge, through which lay the Rossville road. The storm of battle raged with fearful power. The line of heroes seemed again and again about to be swallowed up in the encircling fire. Again and again Longstreet’s troops charged with unexampled impetuosity, and as many times were beaten back bruised and bleeding. The crisis of the battle at half past four in the afternoon, when Longstreet hurled forward his magnificent reserve corps, is said to have rivaled, in tragic importance and far-reaching consequences, the supreme moment in the battle of Gettysburg, when Pickett’s ten thousand Virginians, in solid column, charged upon Cemetery Ridge. But all the valor and all the fury was in vain. “George A. Thomas,” in the words of Garfield, “was indeed the ‘rock of Chickamauga,’ against which the wild waves of battle dashed in vain.” General Garfield, from the moment of his arrival, had plunged into the thickest of the fray. When at last the thinned and shattered lines of gray withdrew, leaving thousands of their dead upon the bloody field, smoked and powder-grimed, he was personally managing a battery of which the chief gunners had been killed at their post. Towards the close of the fight Thomas’s ammunition ran very low. His ammunition trains had become involved with the rout of the right, and were miles in the rear at Rossville. This want of ammunition created more fear than the assaults of the enemy. The last charge was repelled at portions of the line with the bayonet alone.