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As stated, my action in sending Sherman back was expedited by a desire to get him in command of the forces separated from my direct supervision. I feared that delay might bring McClernand, who was his senior and who had authority from the President and Secretary of War to exercise that particular command,—and independently. I doubted McClernand's fitness; and I had good reason to believe that in forestalling him I was by no means giving offence to those whose authority to command was above both him and me.
Neither my orders to General Sherman, nor the correspondence between us or between General Halleck and myself, contemplated at the time my going further south than the Yallabusha. Pemberton's force in my front was the main part of the garrison of Vicksburg, as the force with me was the defence of the territory held by us in West Tennessee and Kentucky. I hoped to hold Pemberton in my front while Sherman should get in his rear and into Vicksburg. The further north the enemy could be held the better.
It was understood, however, between General Sherman and myself that our movements were to be co-operative; if Pemberton could not be held away from Vicksburg I was to follow him; but at that time it was not expected to abandon the railroad north of the Yallabusha. With that point as a secondary base of supplies, the possibility of moving down the Yazoo until communications could be opened with the Mississippi was contemplated.
It was my intention, and so understood by Sherman and his command, that if the enemy should fall back I would follow him even to the gates of Vicksburg. I intended in such an event to hold the road to Grenada on the Yallabusha and cut loose from there, expecting to establish a new base of supplies on the Yazoo, or at Vicksburg itself, with Grenada to fall back upon in case of failure. It should be remembered that at the time I speak of it had not been demonstrated that an army could operate in an enemy's territory depending upon the country for supplies. A halt was called at Oxford with the advance seventeen miles south of there, to bring up the road to the latter point and to bring supplies of food, forage and munitions to the front.
On the 18th of December I received orders from Washington to divide my command into four army corps, with General McClernand to command one of them and to be assigned to that part of the army which was to operate down the Mississippi. This interfered with my plans, but probably resulted in my ultimately taking the command in person. McClernand was at that time in Springfield, Illinois. The order was obeyed without any delay. Dispatches were sent to him the same day in conformity.