Nineteen days had passed since Ulysses S. Grant and his army had crossed the Mississippi River south of Vicksburg, Mississippi. After four pitched battles and numerous other fights, Grant's three army corps arrived at Vicksburg and began the siege of the town. From the memoirs of William Tecumseh Sherman.
We pushed on, and reached the Big Black early, Blair's troops having preceded us by an hour or so. I found General Blair in person, and he reported that there was no bridge across the Big Black; that it was swimming-deep; and that there was a rebel force on the opposite side, intrenched. He had ordered a detachment of the Thirteenth United States Regulars, under Captain Charles Ewing, to strip some artillery-horses, mount the men, and swim the river above the ferry, to attack and drive away the party on the opposite bank. I did not approve of this risky attempt, but crept down close to the brink of the river bank, behind a corn-crib belonging to a plantation house near by, and saw the parapet on the opposite bank. Ordering a section of guns to be brought forward by hand behind this corn-crib, a few well-directed shells brought out of their holes the little party that was covering the crossing, viz., a lieutenant and ten men, who came down to the river-bank and surrendered. Blair's pontoon-train was brought up, consisting of India-rubber boats, one of which was inflated, used as a boat, and brought over the prisoners. A pontoon-bridge was at once begun, finished by night, and the troops began the passage. After dark, the whole scene was lit up with fires of pitch-pine. General Grant joined me there, and we sat on a log, looking at the passage of the troops by the light of those fires; the bridge swayed to and fro under the passing feet, and made a fine war-picture. At daybreak we moved on, ascending the ridge, and by 10 a.m. the head of my column, long drawn out, reached the Benton road, and gave us command of the peninsula between the Yazoo and Big Black. I dispatched Colonel Swan, of the Fourth Iowa Cavalry, to Haines's Bluff, to capture that battery from the rear, and he afterward reported that he found it abandoned, its garrison having hastily retreated into Vicksburg, leaving their guns partially disabled, a magazine full of ammunition, and a hospital full of wounded and sick men. Colonel Swan saw one of our gunboats lying about two miles below in the Yazoo, to which he signaled. She steamed up, and to its commander the cavalry turned over the battery at Haines's Bluff, and rejoined me in front of Vicksburg. Allowing a couple of hours for rest and to close up the column, I resumed the march straight on Vicksburg. About two miles before reaching the forts, the road forked; the left was the main Jackson road, and the right was the "graveyard" road, which entered Vicksburg near a large cemetery. General Grant in person directed me to take the right-hand road, but, as McPherson had not yet got up from the direction of the railroad-bridge at Big Black, I sent the Eighth Missouri on the main Jackson road, to push the rebel skirmishers into town, and to remain until relieved by McPherson's advance, which happened late that evening, May 18th. The battalion of the Thirteenth United States Regulars, commanded by Captain Washington, was at the head of the column on the right-hand road, and pushed the rebels close behind their parapets; one of my staff, Captain Pitzman, receiving a dangerous wound in the hip, which apparently disabled him for life. By night Blair's whole division had closed up against the defenses of Vicksburg, which were found to be strong and well manned; and, on General Steele's head of column arriving, I turned it still more to the right, with orders to work its way down the bluff, so as to make connection with our fleet in the Mississippi River. There was a good deal of desultory fighting that evening, and a man was killed by the aide of General Grant and myself, as we sat by the road-side looking at Steele's division passing to the right. General Steele's men reached the road which led from Vicksburg up to Haines's Bluff, which road lay at the foot of the hills, and intercepted some prisoners and wagons which were coming down from Haines's Bluff.
All that night McPherson's troops were arriving by the main Jackson road, and McClernand's by another near the railroad, deploying forward as fast as they struck the rebel works. My corps (the Fifteenth) had the right of the line of investment; McPherson's (the Seventeenth) the centre; and McClernand's (the Thirteenth) the left, reaching from the river above to the railroad below. Our lines connected, and invested about three-quarters of the land-front of the fortifications of Vicksburg.