Rosecrans had permitted McCook to thin out his lines over too much space, while on that very part of the field Bragg had concentrated his forces for the heaviest attack. The plans of battle made by the two opposing commanders were strikingly similar. Rosecrans' plan was to throw his left wing, under Crittenden, across the river upon the Confederate right under Breckinridge, to crush it in one impetuous dash, and to swing around through Murfreesboro to the Franklin road and cut off the Confederate line of retreat. Bragg, on the other hand, intended to make a similar dash upon the Union right, pivot upon his center, press back McCook upon that center, crumpling the Federals and seizing the Nashville turnpike to cut off Rosecrans' retreat toward Nashville. Neither, of course, knew of the other's plan, and much would depend on who would strike first. At the early light of the last day of the year the Confederate left wing moved upon the Union right in a magnificent battle-line, three-quarters of a mile in length and two columns deep. At the same time the Confederate artillery opened with their cannon. McCook was astonished at so fierce and sudden a charge. The gallant Patrick Cleburne, one of the ablest commanders in the Southern armies, led his division, which had been brought from the Confederate right, in the charge. The Federal lines were ill prepared for this sudden onslaught, and before McCook could arrange them several batteries were overpowered and eleven of the heavy guns were in the hands of the Confederates. Slowly the Union troops fell back, firing as they went; but they had no power to check the impetuous, overwhelming charge of the onrushing foe. McCook's two right divisions, under Johnson and Jeff. C. Davis, were driven back, but his third division, which was commanded by a young officer who had attracted unusual attention at the battle of Perryville--Philip H. Sheridan--held its ground. At the first Confederate advance, Sill's brigade of Sheridan's division drove the troops in front of it back into their entrenchments, and in the charge the brave Sill lost his life. While the battle raged with tremendous fury on the Union right, Rosecrans was three miles away, throwing his left across the river. Hearing the terrific roar of battle at the other end of the line, Rosecrans hastened to begin his attack on Breckinridge hoping to draw a portion of the Confederate force away from McCook. But as the hours of the forenoon passed he was dismayed as he noted that the sound of battle was coming nearer, and he rightly divined that his right wing was receding before the dashing soldiers of the South. He ordered McCook to dispute every inch of the ground; but McCook's command was soon torn to pieces and disorganized, except the division of Sheridan.