That something unforeseen was at hand; and our pleasant dreams were destined to fade away like an unsubstantial pageant, leaving not a rack behind. At four o'clock on the morning of the 14th I was roused from sleep by loud knocks on the new-made door. In the order which followed, "Be ready to march at daybreak," I recognized the familiar, but unwelcome voice of the Sergeant-Major. Throwing aside my blankets, and leaving the Captain dreamily wondering what could be the occasion of so unexpected an order, I hurried to the quarters of the men of Company D, and repeated to the Orderly Sergeant the instructions just received. The camp was soon astir. Lights flashed here and there through the trees. "Pack up! pack up!" passed from lip to lip. "Shall we take everything?" Yes, everything. The shelter-tents were stripped from the houses, knapsacks and trunks were packed. The wagon for the officers' baggage came, was hurriedly loaded, and driven away. A hasty breakfast followed. Then, forming our line, we stacked arms, and awaited further orders. The mystery was soon solved. Longstreet, having cut loose from Bragg's army, which still remained in the vicinity of Chattanooga, had, by a forced march, struck the Tennessee River at Hough's Ferry, a few miles below Loudon. Already he had thrown a pontoon across the river, and was crossing with his entire command, except the cavalry under Wheeler, which he had sent by way of Marysville, with orders to seize the heights on the south bank of the Holston, opposite Knoxville. The whole movement was the commencement of a series of blunders on the part of the Rebel commanders in this department, which resulted at length in the utter overthrow of the Rebel army of the Tennessee. General Grant saw at once the mistake which the enemy had made, and ordered General Burnside to fall back to Knoxville and intrench, promising reinforcements speedily. Knoxville was Longstreet's objective. It was the key of East Tennessee. Should it again fall into the enemy's hands, we would be obliged to retire to Cumberland Gap. Lenoir's did not lie in Longstreet's path. If we remained there, he would push his columns past our right, and get between us and Knoxville. It was evident that the place must be abandoned; and there was need of haste. The mills and factories in the village were accordingly destroyed, and the wagon-train started north. The morning had opened heavily with clouds, and, as the day advanced, the rain came down in torrents. A little before noon, our division, then under the command of General Ferrero, moved out of the woods; but, instead of taking the road to Knoxville, as we had anticipated, the column marched down the Loudon road. We were to watch the enemy, and, by holding him in check, secure the safety of our trains and material, then on the way to Knoxville.