General McCook received orders to advance upon General Hardee, who occupied a position on the Nolensville road. General Thomas was ordered to the Franklin road, so as to threaten Hardee’s flank; and, by a crossroad, to form a junction with McCook. And General Crittenden was ordered to advance on the Murfreesboro’ road, as far as Lavergne. These movements being carried out caused the retreat of Hardee toward Murfreesboro’. Encountering considerable opposition from the rebels, and being compelled to feel their way over a totally unknown and wooded country, the National force had all crossed over to the Murfreesboro’ road. On the night of Tuesday, the 30th of December, General Rosecrans had his line formed. The relative positions of the armies were then as follows: The rebels were intrenched in a thick wood about two miles in front of Murfreesboro’; their lines extending along both sides of a stream, the right under command of General Polk, the left commanded by General Hardee, and the centre by General Smith. The line of battle of the National troops was drawn up directly opposite that of the rebels, with General Crittenden holding the left, which rested on Stone River; General McCook the right, and General Thomas the centre. While General Rosecrans was deciding the method of attack, and explaining it to his corps commanders, the rebel General had decided to take the aggressive. The rebel attack was cleverly managed. Without any demonstration, the enemy suddenly emerged from the woods in which they had been concealed, at about seven o’clock on the morning of the 31st of December, and steadily and noiselessly advanced toward the National line. The troops had fallen in line on the first news of the enemy’s approach, and quietly awaited their coming; but notwithstanding this, however, the unexpected nature of the attack threw the Union troops into confusion, in a very short time the infantry breaking and retreating without a single shot. There was much brave but fruitless fighting. The dense masses of the enemy bore down upon the enfeebled National line, and were bravely met; but continued resistance was impossible. A large part of McCook’s ammunition and subsistence trains were captured by the enemy. The day was plainly against the Federals; and, for the time, it might have been said that General Rosecrans was defeated even before his attack had begun. Unless the battle-field was at once given up to the rebels, it became evident that a complete and immediate change of plan was essential to the maintenance of even a show of resistance to the enemy. General McCook’s army was almost broken up; and upon the centre the firing only increased in fury.