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Grand Gulf is on a high bluff where the river runs at the very foot of it. It is as defensible upon its front as Vicksburg and, at that time, would have been just as impossible to capture by a front attack. I therefore requested Porter to run the batteries with his fleet that night, and to take charge of the transports, all of which would be wanted below.
There is a long tongue of land from the Louisiana side extending towards Grand Gulf, made by the river running nearly east from about three miles above and nearly in the opposite direction from that point for about the same distance below. The land was so low and wet that it would not have been practicable to march an army across but for a levee. I had had this explored before, as well as the east bank below to ascertain if there was a possible point of debarkation north of Rodney. It was found that the top of the levee afforded a good road to march upon.
Porter, as was always the case with him, not only acquiesced in the plan, but volunteered to use his entire fleet as transports. I had intended to make this request, but he anticipated me. At dusk, when concealed from the view of the enemy at Grand Gulf, McClernand landed his command on the west bank. The navy and transports ran the batteries successfully. The troops marched across the point of land under cover of night, unobserved. By the time it was light the enemy saw our whole fleet, ironclads, gunboats, river steamers and barges, quietly moving down the river three miles below them, black, or rather blue, with National troops.
When the troops debarked, the evening of the 29th, it was expected that we would have to go to Rodney, about nine miles below, to find a landing; but that night a colored man came in who informed me that a good landing would be found at Bruinsburg, a few miles above Rodney, from which point there was a good road leading to Port Gibson some twelve miles in the interior. The information was found correct, and our landing was effected without opposition.
Sherman had not left his position above Vicksburg yet. On the morning of the 27th I ordered him to create a diversion by moving his corps up the Yazoo and threatening an attack on Haines' Bluff
My object was to compel Pemberton to keep as much force about Vicksburg as I could, until I could secure a good footing on high land east of the river. The move was eminently successful and, as we afterwards learned, created great confusion about Vicksburg and doubts about our real design. Sherman moved the day of our attack on Grand Gulf, the 29th, with ten regiments of his command and eight gunboats which Porter had left above Vicksburg.
He debarked his troops and apparently made every preparation to attack the enemy while the navy bombarded the main forts at Haines' Bluff. This move was made without a single casualty in either branch of the service. On the first of May Sherman received orders from me (sent from Hard Times the evening of the 29th of April) to withdraw from the front of Haines' Bluff and follow McPherson with two divisions as fast as he could.
I had established a depot of supplies at Perkins' plantation. Now that all our gunboats were below Grand Gulf it was possible that the enemy might fit out boats in the Big Black with improvised armament and attempt to destroy these supplies. McPherson was at Hard Times with a portion of his corps, and the depot was protected by a part of his command. The night of the 29th I directed him to arm one of the transports with artillery and send it up to Perkins' plantation as a guard; and also to have the siege guns we had brought along moved there and put in position.
The embarkation below Grand Gulf took place at De Shroon's, Louisiana, six miles above Bruinsburg, Mississippi. Early on the morning of 30th of April McClernand's corps and one division of McPherson's corps were speedily landed.
When this was effected I felt a degree of relief scarcely ever equalled since. Vicksburg was not yet taken it is true, nor were its defenders demoralized by any of our previous moves. I was now in the enemy's country, with a vast river and the stronghold of Vicksburg between me and my base of supplies. But I was on dry ground on the same side of the river with the enemy. All the campaigns, labors, hardships and exposures from the month of December previous to this time that had been made and endured, were for the accomplishment of this one object.
I had with me the 13th corps, General McClernand commanding, and two brigades of Logan's division of the 17th corps, General McPherson commanding—in all not more than twenty thousand men to commence the campaign with. These were soon reinforced by the remaining brigade of Logan's division and Crocker's division of the 17th corps. On the 7th of May I was further reinforced by Sherman with two divisions of his, the 15th corps. My total force was then about thirty-three thousand men.
The enemy occupied Grand Gulf, Haines' Bluff and Jackson with a force of nearly sixty thousand men. Jackson is fifty miles east of Vicksburg and is connected with it by a railroad. My first problem was to capture Grand Gulf to use as a base.
Bruinsburg is two miles from high ground. The bottom at that point is higher than most of the low land in the valley of the Mississippi, and a good road leads to the bluff. It was natural to expect the garrison from Grand Gulf to come out to meet us and prevent, if they could, our reaching this solid base. Bayou Pierre enters the Mississippi just above Bruinsburg and, as it is a navigable stream and was high at the time, in order to intercept us they had to go by Port Gibson, the nearest point where there was a bridge to cross upon. This more than doubled the distance from Grand Gulf to the high land back of Bruinsburg. No time was to be lost in securing this foothold. Our transportation was not sufficient to move all the army across the river at one trip, or even two; but the landing of the 13th corps and one division of the 17th was effected during the day, April 30th, and early evening. McClernand was advanced as soon as ammunition and two days' rations (to last five) could be issued to his men. The bluffs were reached an hour before sunset and McClernand was pushed on, hoping to reach Port Gibson and save the bridge spanning the Bayou Pierre before the enemy could get there; for crossing a stream in the presence of an enemy is always difficult. Port Gibson, too, is the starting point of roads to Grand Gulf, Vicksburg and Jackson.
McClernand's advance met the enemy about five miles west of Port Gibson at Thompson's plantation. There was some firing during the night, but nothing rising to the dignity of a battle until daylight. The enemy had taken a strong natural position with most of the Grand Gulf garrison, numbering about seven or eight thousand men, under General Bowen. His hope was to hold me in check until reinforcements under Loring could reach him from Vicksburg; but Loring did not come in time to render much assistance south of Port Gibson. Two brigades of McPherson's corps followed McClernand as fast as rations and ammunition could be issued, and were ready to take position upon the battlefield whenever the 13th corps could be got out of the way.
The country in this part of Mississippi stands on edge, as it were, the roads running along the ridges except when they occasionally pass from one ridge to another. Where there are no clearings the sides of the hills are covered with a very heavy growth of timber and with undergrowth, and the ravines are filled with vines and canebrakes, almost impenetrable. This makes it easy for an inferior force to delay, if not defeat, a far superior one.
Near the point selected by Bowen to defend, the road to Port Gibson divides, taking two ridges which do not diverge more than a mile or two at the widest point. These roads unite just outside the town. This made it necessary for McClernand to divide his force. It was not only divided, but it was separated by a deep ravine of the character above described. One flank could not reinforce the other except by marching back to the junction of the roads. McClernand put the divisions of Hovey, Carr and A. J. Smith upon the right-hand branch and Osterhaus on the left. I was on the field by ten A.M., and inspected both flanks in person. On the right the enemy, if not being pressed back, was at least not repulsing our advance. On the left, however, Osterhaus was not faring so well. He had been repulsed with some loss. As soon as the road could be cleared of McClernand's troops I ordered up McPherson, who was close upon the rear of the 13th corps, with two brigades of Logan's division. This was about noon. I ordered him to send one brigade (General John E. Smith's was selected) to support Osterhaus, and to move to the left and flank the enemy out of his position. This movement carried the brigade over a deep ravine to a third ridge and, when Smith's troops were seen well through the ravine, Osterhaus was directed to renew his front attack. It was successful and unattended by heavy loss. The enemy was sent in full retreat on their right, and their left followed before sunset. While the movement to our left was going on, McClernand, who was with his right flank, sent me frequent requests for reinforcements, although the force with him was not being pressed. I had been upon the ground and knew it did not admit of his engaging all the men he had. We followed up our victory until night overtook us about two miles from Port Gibson; then the troops went into bivouac for the night.