The enemy had concentrated the bulk of his forces east of the Mississippi into two armies, commanded by Generals R. E. Lee and J. E. Johnston, his ablest and best generals. The army commanded by Lee occupied the south bank of the Rapidan, extending from Mine Run westward, strongly intrenched, covering and defending Richmond, the rebel capital, against the Army of the Potomac.
The army under Johnston occupied a strongly intrenched position at Dalton, Georgia, covering and defending Atlanta, Georgia, a place of great importance as a railroad centre, against the armies under Major-General W. T. Sherman. In addition to these armies he had a large cavalry force under Forrest, in North-east Mississippi; a considerable force, of all arms, in the Shenandoah Valley, and in the western part of Virginia and extreme eastern part of Tennessee; and also confronting our sea-coast garrisons, and holding blockaded ports where we had no foothold upon land.
These two armies, and the cities covered and defended by them, were the main objective points of the campaign.
Major-General W. T. Sherman, who was appointed to the command of the Military Division of the Mississippi, embracing all the armies and territory east of the Mississippi River to the Alleghanies and the Department of Arkansas, west of the Mississippi, had the immediate command of the armies operating against Johnston.
Major-General George G. Meade had the immediate command of the Army of the Potomac, from where I exercised general supervision of the movements of all our armies.
General Sherman was instructed to move against Johnston's army, to break it up, and to go into the interior of the enemy's country as far as he could, inflicting all the damage he could upon their war resources. If the enemy in his front showed signs of joining Lee, to follow him up to the full extent of his ability, while I would prevent the concentration of Lee upon him, if it was in the power of the Army of the Potomac to do so. More specific written instructions were not given, for the reason that I had talked over with him the plans of the campaign, and was satisfied that he understood them and would execute them to the fullest extent possible.
Major-General N. P. Banks, then on an expedition up Red River against Shreveport, Louisiana (which had been organized previous to my appointment to command), was notified by me on the 15th of March, of the importance it was that Shreveport should be taken at the earliest possible day, and that if he found that the taking of it would occupy from ten to fifteen days' more time than General Sherman had given his troops to be absent from their command, he would send them back at the time specified by General Sherman, even if it led to the abandonment of the main object of the Red River expedition, for this force was necessary to movements east of the Mississippi; that should his expedition prove successful, he would hold Shreveport and the Red River with such force as he might deem necessary, and return the balance of his troops to the neighborhood of New Orleans, commencing no move for the further acquisition of territory, unless it was to make that then held by him more easily held; that it might be a part of the spring campaign to move against Mobile; that it certainly would be, if troops enough could be obtained to make it without embarrassing other movements; that New Orleans would be the point of departure for such an expedition; also, that I had directed General Steele to make a real move from Arkansas, as suggested by him (General Banks), instead of a demonstration, as Steele thought advisable.
On the 31st of March, in addition to the foregoing notification and directions, he was instructed as follows:
"1st. If successful in your expedition against Shreveport, that you turn over the defence of the Red River to General Steele and the navy.
"2d. That you abandon Texas entirely, with the exception of your hold upon the Rio Grande. This can be held with four thousand men, if they will turn their attention immediately to fortifying their positions. At least one-half of the force required for this service might be taken from the colored troops.
"3d. By properly fortifying on the Mississippi River, the force to guard it from Port Hudson to New Orleans can be reduced to ten thousand men, if not to a less number. Six thousand more would then hold all the rest of the territory necessary to hold until active operations can again be resumed west of the river.
According to your last return, this would give you a force of over thirty thousand effective men with which to move against Mobile. To this I expect to add five thousand men from Missouri. If however, you think the force here stated too small to hold the territory regarded as necessary to hold possession of, I would say concentrate at least twenty-five thousand men of your present command for operations against Mobile. With these and such additions as I can give you from elsewhere, lose no time in making a demonstration, to be followed by an attack upon Mobile. Two or more iron-clads will be ordered to report to Admiral Farragut. This gives him a strong naval fleet with which to co-operate. You can make your own arrangements with the admiral for his co-operation, and select your own line of approach. My own idea of the matter is that Pascagoula should be your base; but, from your long service in the Gulf Department, you will know best about the matter. It is intended that your movements shall be co-operative with movements elsewhere, and you cannot now start too soon. All I would now add is, that you commence the concentration of your forces at once. Preserve a profound secrecy of what you intend doing, and start at the earliest possible moment.
"U. S. GRANT, Lieutenant-General.
"MAJOR-GENERAL N. P. BANKS."
