I had no great expectations of important results from the former of these, but having more troops than could be employed to advantage at Young's Point, and knowing that Lake Providence was connected by Bayou Baxter with Bayou Macon, a navigable stream through which transports might pass into the Mississippi below, through Tensas, Wachita, and Red rivers, I thought it possible that a route might be opened in that direction which would enable me to co-operate with General Banks at Port Hudson.
By the Yazoo Pass route I only expected at first to get into the Yazoo by way of Coldwater and Tallahatchie with some lighter gunboats and a few troops and destroy the enemy's transports in that stream and some gunboats which I knew he was building. The navigation, however, proved so much better than had been expected that I thought for a time of the possibility of making this the route for obtaining a foothold on high land above Haines Bluff, Mississippi, and small class steamers were accordingly ordered for transporting an army that way. Major-General J. B. McPherson, commanding seventeenth army corps, was directed to have his corps in readiness to move by this route; and one division from each the thirteenth and fifteenth corps were collected near the entrance of the Pass to be added to his command. It soon became evident that a sufficient number of boats of the right class could not be obtained for the movement of more than one division.
Whilst my forces were opening one end of the Pass the enemy was diligently closing the other end, and in this way succeeded in gaining time to strongly fortify Greenwood, below the junction of the Tallahatchie and Yallobusha. The advance of the expedition, consisting of one division of McClernand's corps from Helena, commanded by Brigadier-General L. F. Ross, and the 12th and 17th regiments of Missouri infantry, from Sherman's corps, as sharpshooters on the gunboats, succeeded in reaching Coldwater on the 2d day of March, after much difficulty, and the partial disabling of most of the boats. From the entrance into Coldwater to Fort Pemberton, at Greenwood, Mississippi, no great difficulty of navigation was experienced nor any interruption of magnitude from the enemy. Fort Pemberton extends from the Tallahatchie to the Yazoo at Greenwood. Here the two rivers come within a few hundred yards of each other. The land around the fort is low, and at the time of the attack was entirely overflowed. Owing to this fact, no movement could be made by the army to reduce it, but all depended upon the ability of the gunboats to silence the guns of the enemy and enable the transports to run down and land troops immediately on the fort itself. After an engagement of several hours the gunboats drew off, being unable to silence the batteries. Brigadier-General I. F. Quinby, commanding a division of McPherson's corps, met the expedition under Ross with his division on its return from Fort Pemberton, on the 21st of March, and being the senior, assumed command of the entire expedition, and returned to the position Ross had occupied.
On the 23d of March I sent orders for the withdrawal of all the forces operating in that direction, for the purpose of concentrating my army on Milliken's Bend.
On the 14th day of March, Admiral D. D. Porter, commanding Mississippi squadron, informed me that he had made a reconnoissance up Steele's Bayou, and partially through Black Bayou toward Deer Creek, and so far as explored these water courses were reported navigable for the smaller iron-clads. Information given mostly, I believe, by the negroes of the country, was to the effect that Deer Creek could be navigated to Rolling Fork, and that from there through the Sunflower to the Yazoo river there was no question about the navigation. On the following morning I accompanied Admiral Porter in the ram Price, several iron-clads preceding us, up through Steele's Bayou to near Black Bayou.
At this time our forces were at a dead-lock at Greenwood, and I looked upon the success of this enterprise as of vast importance. It would, if successful, leave Greenwood between two forces of ours, and would necessarily cause the immediate abandonment of that stronghold.
About thirty steamers of the enemy would have been destroyed or fallen into our hands. Seeing that the great obstacle to navigation, so far as I had gone, was from overhanging trees, I left Admiral Porter near Black Bayou and pushed back to Young's Point for the purpose of sending forward a Pioneer corps to remove these difficulties. Soon after my return to Young's Point Admiral Porter sent back to me for a co-operating force. Sherman was promptly sent with one division of his corps. The number of steamers suitable for the navigation of these bayous being limited, most of the force was sent up the Mississippi river to Eagle's Bend, a point where the river runs within one mile of Steele's Bayou, thus saving an important part of this difficult navigation. The expedition failed, probably more from want of knowledge as to what would be required to open this route than from any impracticability in the navigation of the streams and bayous through which it was proposed to pass. Want of this knowledge led the expedition on until difficulties were encountered, and then it would become necessary to send back to Young's Point for the means of removing them. This gave the enemy time to move forces to effectually checkmate further progress, and the expedition was withdrawn when within a few hundred yards of free and open navigation to the Yazoo.
All this may have been providential in driving us ultimately to a line of operations which has proven eminently successful.
For further particulars of Steele's Bayou expedition see report of Major-General W. T. Sherman, forwarded on the 12th of April.
As soon as I decided to open water communication from a point on the Mississippi near Milliken's Bend to New Carthage I determined to occupy the latter place, it being the first point below Vicksburg that could be reached by land at the stage of water then existing, and the occupancy of which, while it secured to us a point on the Mississippi river, would also protect the main line of communication by water. Accordingly the thirteenth army corps, Major-General J. A. McClernand commanding, was directed to take up its line of march on the 29th day of March for New Carthage, the fifteenth and seventeenth corps to follow, moving no faster than supplies and ammunition could be transported to them.