Grant's plan of battle was simple, as his plans of battle usually were. He ordered Sherman to carry Missionary Ridge, which constituted the extreme right of the Confederate position, while Thomas and Hooker should so far engage the remainder of the line as to prevent the reinforcement of that point upon which his chief assault was to be made. If he could accomplish this Bragg must either retreat, abandoning his threat against Chattanooga, or he must seek some point at which to give battle again with a force so far weakened by detachment as to render battle a dangerous alternative for him. Sherman advanced on the twenty-fourth of November. His assault was repulsed and for the time unsuccessful. Hooker, in the meanwhile, exceeded his orders, and did a good deal more fighting than Grant had intended him to do. It was his assigned duty merely to engage that part of the Confederate lines which lay in front of him, sufficiently to prevent the sending of any force from it to reinforce the Confederate right. But Hooker was by instinct a fighter at all times. And on this occasion he pushed his men boldly into a fight that his commanding officer had not intended. His force climbed to the extreme summit of the mountain, passing a zone of mist and fog as they went. Having reached the summit they routed the Confederates there and made themselves masters of the heights. The fact that they passed through this fog zone on their way up led to the poetic nicknaming of this action as the "Battle above the Clouds." It was not, properly speaking, a battle at all, and it was not above the clouds in the sense in which that phrase impresses the ordinary mind. On the twenty-fifth Grant pushed Thomas again into the fight, and assailed the position on Missionary Ridge. A very gallant and very vigorous action followed. It resulted in the Federals carrying the Ridge, sweeping everything before them, and driving Bragg's army into full retreat. He retired with what remained of his force to Dalton, Georgia, and almost immediately afterward Gen. Joseph E. Johnston was ordered to take command in that quarter in his stead. The campaign had been dramatic in many of its features, and peculiarly picturesque in some of them. It had cost the lives of from six to ten thousand men on either side. It left the Federals masters of Chattanooga, placing the Confederates in an uncertain defensive position against which future operations were comparatively easy. CHAPTER XLIII GRANT'S STRATEGY--THE RED RIVER CAMPAIGN--FORT PILLOW, ETC.