While Grant was making his marches, fighting his battles, and carrying on his siege operations in Virginia, Sherman in the West was performing the task assigned to him by his chief, to pursue, destroy, or capture the principal western Confederate army, now commanded by General Johnston.  The forces which under Bragg had been defeated in the previous autumn at Lookout Mountain and Missionary Ridge, had halted as soon as pursuit ceased, and remained in winter quarters at and about Dalton, only twenty-eight or thirty miles on the railroad southeast of Chattanooga where their new commander, Johnston, had, in the spring of 1864, about sixty-eight thousand men with which to oppose the Union advance.

A few preliminary campaigns and expeditions in the West need not here be detailed, as they were not decisive.  One, however, led by Sherman himself from Vicksburg to Meridian, must be mentioned, since, during the month of February, it destroyed about one hundred miles of the several railroads centering at the latter place, and rendered the whole railroad system of Mississippi practically useless to the Confederates, thus contributing essentially to the success of his future operations.

Sherman prepared himself by uniting at Chattanooga the best material of the three Union armies, that of the Cumberland, that of the Tennessee, and that of the Ohio, forming a force of nearly one hundred thousand men with two hundred and fifty-four guns.  They were seasoned veterans, whom three years of campaigning had taught how to endure every privation, and avail themselves of every resource.  They were provided with every essential supply, but carried with them not a pound of useless baggage or impedimenta that could retard the rapidity of their movements.

Sherman had received no specific instructions from Grant, except to fight the enemy and damage the war resources of the South; but the situation before him clearly indicated the city of Atlanta, Georgia, as his first objective, and as his necessary route, the railroad leading thither from Chattanooga.  It was obviously a difficult line of approach, for it traversed a belt of the Alleghanies forty miles in width, and in addition to the natural obstacles they presented, the Confederate commander, anticipating his movement, had prepared elaborate defensive works at the several most available points.

As agreed upon with Grant, Sherman began his march on May 5, 1864, the day following that on which Grant entered upon his Wilderness campaign in Virginia.  These pages do not afford space to describe his progress.  It is enough to say that with his double numbers he pursued the policy of making strong demonstrations in front, with effective flank movements to threaten the railroad in the Confederate rear, by which means he forced back the enemy successively from point to point, until by the middle of July he was in the vicinity of Atlanta, having during his advance made only one serious front attack, in which he met a costly repulse.  His progress was by no means one of mere strategical manoeuver.  Sherman says that during the month of May, across nearly one hundred miles of as difficult country as was ever fought over by civilized armies, the fighting was continuous, almost daily, among trees and bushes, on ground where one could rarely see one hundred yards ahead.