By the continued successes of the flotilla on the Mississippi, Memphis, after a brilliant naval engagement, fell into the hands of the Union force. Grant, as the commander of the Tennessee district, established his headquarters at this city. Pope was ordered to Virginia, to supersede Fremont, where he established his celebrated "headquarters in the saddle."

McClellan had gradually felt his way down to the vicinity of Richmond, when the rebels, out of patience with him, fell upon his forces, and drove him to the shelter of the gunboats on the James, after his glorious army had fought some of the most brilliant defensive battles of the war. The country cried out against him for this delay, derided his use of the pick and shovel, and unhorsed him because he neglected his opportunities. While he was still resting from his hard-fought but useless battles, the government removed him from his position of general-in-chief, and assigned General Halleck to his place, probably on account of his brilliant operations before Corinth, where he had played through the farce of "regular approaches," though with none of the tragic features which attended it before Richmond.

Halleck was now in power, and one of his first acts, even before he left for Washington, was to offer the command of the army of the Tennessee to Colonel Allen, a quartermaster. This gentleman, who was to be promoted to the required rank, to enable him to accept the command, had the good sense to decline it, and Grant was permitted to retain his position. He was deprived of nearly his entire force, and left to maintain a defensive position. He made his headquarters at Corinth, protecting the railroad communications, and holding what had before been gained. He spent the summer in this manner, though with enough to do to keep him busy, for he was continually harassed and threatened by the enemy under Van Dorn and Price.

Halleck, in his new capacity of general-in-chief, had his hands full in attending to McClellan and Pope. Grant seems to have been forgotten, and was thereby permitted to manage the affairs of his district without being hampered with instructions. The North was in danger of invasion in Maryland, rendered possible by the disastrous battles of Pope, and in Ohio by the rebel army under General Bragg, who had out-generaled the prudent and deliberate Buell. In these emergencies, Grant's men were taken from him, till the smallness of his force afforded even him no little anxiety.

Van Dorn, in command of the rebels in this section, ordered Price to seize Iuka, which was done. Van Dorn himself was four days' march to the south-west, threatening Corinth. Grant wished to overwhelm Price at Iuka, without exposing Corinth to capture by Van Dorn. He sent out two columns, one under Rosecrans and the other under Ord, to accomplish this purpose. A sharp battle followed, but the intention to capture Price's army failed, on account of a delay of one of the columns in reaching the point of attack. The rebels escaped, and effected a junction with Van Dorn.

Placing Rosecrans in command of Corinth, Grant established his headquarters at Jackson, Tennessee, where he could better control the affairs of his district. On the 2d of October, the rebels united all their forces in this vicinity, and attacked Corinth, making a good fight, and gaining decided advantages; but in the end they were defeated, and the place saved. The force of the enemy was double that of Rosecrans, who behaved with distinguished gallantry. The defensive works which had been erected under Grant's direction proved to be of immense service, and showed that the general who had been severely criticised for neglecting them before knew when and where to use them—knew when they were necessary, and where they were a hinderance.

Grant had marked out this campaign himself; and though the battle of Corinth had been fought, and the rebels defeated, there was to be a sequel to the affair. Reading the intention of the foe to attack his strong place, he sent McPherson with a brigade to the assistance of Rosecrans; but he arrived only in season to witness the conclusion of the fight, being obliged to make a detour in order to effect his junction. Grant, with his usual confidence in the success of his combinations, had also sent Generals Ord and Hurlbut, each with a brigade, to punish still further the audacious foe in his retreat. He had notified Rosecrans of his plan, and directed him to follow up the retreating enemy vigorously, as well to insure his complete discomfiture, as to save either Ord or Hurlbut from being separately overwhelmed by a superior force. But these two commanders had joined their brigades, and Ord posted the whole so as to cover a bridge on the Hatchie River.

Van Dorn's column pushed on, and its advance crossed the bridge, when Ord's force attacked vigorously, and immediately routed it. A battery of artillery and several hundred men were captured, and the advance scattered, many of the rebels being drowned in their attempt to cross the river. Ord held the bridge, but had not strength enough to attack the entire rebel army, which he compelled to retrace its steps, and seek another bridge six miles distant. Unfortunately, Ord was wounded in the conflict, and Hurlbut, who succeeded to the command, did not deem it prudent even to harass the fleeing rebels in the rear or on the flanks.