During the night of the 2d of May the bridge over the North Fork was repaired, and the troops commenced crossing at five the next morning. Before the leading brigade was over it was fired upon by the enemy from a commanding position; but they were soon driven off. It was evident that the enemy was covering a retreat from Grand Gulf to Vicksburg. Every commanding position from this (Grindstone) crossing to Hankinson's ferry over the Big Black was occupied by the retreating foe to delay our progress.
McPherson, however, reached Hankinson's ferry before night, seized the ferry boat, and sent a detachment of his command across and several miles north on the road to Vicksburg. When the junction of the road going to Vicksburg with the road from Grand Gulf to Raymond and Jackson was reached, Logan with his division was turned to the left towards Grand Gulf. I went with him a short distance from this junction. McPherson had encountered the largest force yet met since the battle of Port Gibson and had a skirmish nearly approaching a battle; but the road Logan had taken enabled him to come up on the enemy's right flank, and they soon gave way. McPherson was ordered to hold Hankinson's ferry and the road back to Willow Springs with one division; McClernand, who was now in the rear, was to join in this as well as to guard the line back down the bayou. I did not want to take the chances of having an enemy lurking in our rear.
On the way from the junction to Grand Gulf, where the road comes into the one from Vicksburg to the same place six or seven miles out, I learned that the last of the enemy had retreated past that place on their way to Vicksburg. I left Logan to make the proper disposition of his troops for the night, while I rode into the town with an escort of about twenty cavalry. Admiral Porter had already arrived with his fleet. The enemy had abandoned his heavy guns and evacuated the place.
When I reached Grand Gulf May 3d I had not been with my baggage since the 27th of April and consequently had had no change of underclothing, no meal except such as I could pick up sometimes at other headquarters, and no tent to cover me. The first thing I did was to get a bath, borrow some fresh underclothing from one of the naval officers and get a good meal on the flag-ship. Then I wrote letters to the general-in-chief informing him of our present position, dispatches to be telegraphed from Cairo, orders to General Sullivan commanding above Vicksburg, and gave orders to all my corps commanders. About twelve o'clock at night I was through my work and started for Hankinson's ferry, arriving there before daylight. While at Grand Gulf I heard from Banks, who was on the Red River, and who said that he could not be at Port Hudson before the 10th of May and then with only 15,000 men. Up to this time my intention had been to secure Grand Gulf, as a base of supplies, detach McClernand's corps to Banks and co-operate with him in the reduction of Port Hudson.
The news from Banks forced upon me a different plan of campaign from the one intended. To wait for his co-operation would have detained me at least a month. The reinforcements would not have reached ten thousand men after deducting casualties and necessary river guards at all high points close to the river for over three hundred miles. The enemy would have strengthened his position and been reinforced by more men than Banks could have brought. I therefore determined to move independently of Banks, cut loose from my base, destroy the rebel force in rear of Vicksburg and invest or capture the city.
Grand Gulf was accordingly given up as a base and the authorities at Washington were notified. I knew well that Halleck's caution would lead him to disapprove of this course; but it was the only one that gave any chance of success. The time it would take to communicate with Washington and get a reply would be so great that I could not be interfered with until it was demonstrated whether my plan was practicable. Even Sherman, who afterwards ignored bases of supplies other than what were afforded by the country while marching through four States of the Confederacy with an army more than twice as large as mine at this time, wrote me from Hankinson's ferry, advising me of the impossibility of supplying our army over a single road. He urged me to "stop all troops till your army is partially supplied with wagons, and then act as quick as possible; for this road will be jammed, as sure as life." To this I replied: "I do not calculate upon the possibility of supplying the army with full rations from Grand Gulf. I know it will be impossible without constructing additional roads. What I do expect is to get up what rations of hard bread, coffee and salt we can, and make the country furnish the balance." We started from Bruinsburg with an average of about two days' rations, and received no more from our own supplies for some days; abundance was found in the mean time. A delay would give the enemy time to reinforce and fortify.
McClernand's and McPherson's commands were kept substantially as they were on the night of the 2d, awaiting supplies sufficient to give them three days' rations in haversacks. Beef, mutton, poultry and forage were found in abundance. Quite a quantity of bacon and molasses was also secured from the country, but bread and coffee could not be obtained in quantity sufficient for all the men. Every plantation, however, had a run of stone, propelled by mule power, to grind corn for the owners and their slaves. All these were kept running while we were stopping, day and night, and when we were marching, during the night, at all plantations covered by the troops. But the product was taken by the troops nearest by, so that the majority of the command was destined to go without bread until a new base was established on the Yazoo above Vicksburg.