The new project, so Grant told me, was to transfer his army to New Carthage, and from there carry it over the Mississippi, landing it at or about Grand Gulf; to capture this point, and then to operate rapidly on the southern and eastern shore of the Big Black River, threatening at the same time both Vicksburg and Jackson, and confusing the Confederates as to his real objective. If this could be done he believed the enemy would come out of Vicksburg and fight.
The first element in this plan was to open a passage from the Mississippi near Milliken's Bend, above Vicksburg, to the bayou on the west side, which led around to New Carthage below. The length of navigation in this cut-off was about thirty-seven miles, and the plan was to take through with small tugs perhaps fifty barges, enough, at least, to transfer the whole army, with artillery and baggage, to the other side of the Mississippi in twenty-four hours. If necessary, troops were to be transported by the canal, though Grant hoped to march them by the road along its bank. Part of McClernand's corps had already reached New Carthage overland, and Grant was hurrying other troops forward. The canal to the bayou was already half completed, thirty-five hundred men being at work on it when I arrived.
The second part of the plan was to float down the river, past the Vicksburg batteries, half a dozen steamboats protected by defenses of bales of cotton and wet hay; these steamboats were to serve as transports of supplies after the army had crossed the Mississippi.
Perhaps the best evidence of the feasibility of the project was found in the fact that the river men pronounced its success certain. General Sherman, who commanded one of the three corps in Grant's army, and with whom I conversed at length upon the subject, thought there was no difficulty in opening the passage, but that the line would be a precarious one for supplies after the army was thrown across the Mississippi. Sherman's preference was for a movement by way of Yazoo Pass, or Lake Providence, but it was not long before I saw in our daily talks that his mind was tending to the conclusion of General Grant. As for General Grant, his purpose was dead set on the new scheme. Admiral Porter cordially agreed with him.
An important modification was made a few days after my arrival in the plan of operations. It was determined that after the occupation of Grand Gulf the main army, instead of operating up the Big Black toward Jackson, should proceed down the river against Port Hudson, co-operating with General Banks against that point, and that after the capture of Port Hudson the two united forces should proceed against Vicksburg.
There seemed to be only one hitch in the campaign. Grant had intrusted the attack on Grand Gulf to McClernand. Sherman, Porter, and other leading officers believed this a mistake, and talked frankly with me about it. One night when we had all gathered at Grant's headquarters and were talking over the campaign very freely, as we were accustomed to do, both Sherman and Porter protested against the arrangement. But Grant would not be changed. McClernand, he said, was exceedingly desirous of the command. He was the senior of the other corps commanders. He was an especial favorite of the President, and the position which his corps occupied on the ground when the movement was first projected was such that the advance naturally fell to its lot; besides, he had entered zealously into the plan from the first, while Sherman had doubted and criticised, and McPherson, whom Grant said he would really have much preferred, was away at Lake Providence, and though he had approved of the scheme, he had taken no active part in it.
I believed the assignment of this duty to McClernand to be so dangerous that I added my expostulation to those of the generals, and in reporting the case to Mr. Stanton I wrote: "I have remonstrated so far as I could properly do so against intrusting so momentous an operation to McClernand."
Mr. Stanton replied: "Allow me to suggest that you carefully avoid giving any advice in respect to commands that may be assigned, as it may lead to misunderstanding and troublesome complications." Of course, after that I scrupulously observed his directions, even in extreme cases.
As the days went on everybody, in spite of this hitch, became more sanguine that the new project would succeed. For my part I had not a doubt of it, as one can see from this fragment written from Milliken's Bend on April 13th to one of my friends:
"Like all who really know the facts, I feel no sort of doubt that we shall before long get the nut cracked. Probably before this letter reaches New York on its way to you the telegraph will get ahead of it with the news that Grant, masking Vicksburg, deemed impregnable by its defenders, has carried the bulk of his army down the river through a cut-off which he has opened without the enemy believing it could be done; has occupied Grand Gulf, taken Port Hudson, and, effecting a junction with the forces of Banks, has returned up the river to threaten Jackson and compel the enemy to come out of Vicksburg and fight him on ground of his own choosing. Of course this scheme may miscarry in whole or in parts, but as yet the chances all favor its execution, which is now just ready to begin."