The Mississippi River carries three million cubic feet of water past the bluffs of Vicksburg every second, indifferent to the armies gathering on its banks. By the spring of 1863, that river had become the structural spine of the Confederacy, and one city stood between the Union and control of it. Vicksburg, a town of eight thousand perched on a two-hundred-foot limestone bluff, held its guns trained on every vessel that passed below. Jefferson Davis called it the nail holding the two halves of the Confederacy together.
Abraham Lincoln called it the key. For six months, Ulysses Grant had tried to take it. He had flooded the bayous north of the city, cut canals across river bends, and pushed four expeditions through the Yazoo Delta, watching each one dissolve in cypress swamp and Confederate resistance. His critics in Washington multiplied.
Newspaper editors printed his professional obituary. A senator backed by two of Grant’s own subordinates lobbied Lincoln directly to remove him. Lincoln refused. “I can’t spare this man,” he reportedly said.
“He fights. ”
What Grant was preparing violated every principle of military logistics serious officers had spent their careers studying. It required his army to sever its own supply line, move deep into hostile territory with nothing but what it could carry or take, and fight its way through the heart of Mississippi before the Confederates could concentrate enough force to stop him. Sherman, his most trusted subordinate, drafted a memorandum urging him in the strongest possible terms to abandon the plan.
Grant read it, filed it, and gave the order to move. On the night of April 16th, Admiral David Porter ran his fleet of gunboats and supply transports past the Vicksburg batteries under cover of darkness. The Confederates anticipated the move and lit enormous bonfires on the western bank to illuminate the river. The batteries opened fire at close range.
For two and a half hours, the river became a naval battle, shells hissing into the water, the burning hulks of two Union transports drifting south like slow lanterns. When Porter’s fleet emerged below the city, twelve of thirteen vessels were intact. Grant had his crossing. He marched his army south through Louisiana, then crossed the Mississippi at Bruinsburg on April 30th in the largest American amphibious operation before the Second World War.
His army stepped onto Mississippi soil with no supply line behind it and no intention of establishing one. The plan was to move fast enough to deny the Confederates the chance to concentrate, live off the surrounding country, defeat Pemberton’s forces in the field before they could retreat to Vicksburg’s fortifications, and take the city from the rear. The soldiers carried three days of rations. They would not be resupplied for seventeen.
Waiting on the other side was Lieutenant General John C. Pemberton, and his situation carried a particular irony. He was born in Philadelphia, attended West Point, and served in the Mexican War alongside men now attacking him. He married a Virginia woman, chose the Confederacy when war came, and found himself doubted on both sides.
His soldiers distrusted him because of where he was born. His superiors distrusted him because he was methodical in a war that demanded instinct. His theater commander, Joseph Johnston, ordered him to abandon Vicksburg and save the army. Jefferson Davis, whose plantation lay just south of the city, ordered him to hold at all costs.
Between two irreconcilable commands, Pemberton tried to satisfy both simultaneously and could execute neither with conviction. Grant was already moving inland. He struck Confederate forces at Port Gibson on May 1st, forty miles south of Vicksburg, in terrain that was a chaos of loess ridges cut apart by ravines so deep and vegetated they became impassable except along their floors. Visibility dropped to twenty yards in places.
Regiments lost contact in the undergrowth and fired at the sound of voices. Grant’s army was larger than the force defending the town and ground through the terrain on that advantage alone. By nightfall the road north was open. At Raymond on May 12th, a Confederate brigade under Brigadier General John Gregg attacked Grant’s lead division in a hollow below the town, committing his men before he understood the numbers.
The fight was close and furious, the kind where regimental commanders made decisions in isolation because nobody could see far enough to coordinate. Gregg’s men eventually broke and fell back north, but not before making clear that the Confederate soldiers in Mississippi intended to fight. Raymond placed Grant within striking distance of Jackson, the state capital and principal rail hub supplying Confederate forces. He turned east, and on May 14th, in a cold rain that turned roads to paste, Sherman and McPherson struck the city from two directions.
Johnston evacuated north. Grant’s men spent the rest of the day tearing up railroad track, burning warehouses full of military stores, and wrecking the telegraph lines connecting Mississippi to the Confederate command in the east. Then Grant turned west again. The collision came three days later at Champion Hill, and it was the campaign’s fulcrum.
Pemberton had roughly twenty-two thousand men on ridge ground that should have been defensible, steep slopes with few connecting roads. What he lacked was not ground but a clear understanding of Grant’s intentions. The battle lasted nine hours. Grant pushed forward in rolling pressure that forced Pemberton to commit reserves faster than he could move them.
In the early afternoon, a Union division under Alvin Hovey broke through the Confederate center on the hill’s crest, and for a time the entire Confederate army was in danger of being cut in half. Pemberton scraped together a counterattack that briefly retook the hill, but by late afternoon the position was untenable. He lost nearly four thousand men and fell back toward Vicksburg with Grant pressing close. The final confrontation came the next morning at a bridge over the Big Black River.
A Union brigade under Michael Lawler, a three-hundred-pound Illinois farmer who had served in two previous wars, saw a gap in the Confederate position and charged before anyone authorized him to do so. The Confederate line dissolved in eighteen minutes. Pemberton burned the bridge behind his survivors and fell back to the city. On May 18th, the first Union soldiers climbed the ridgelines east of Vicksburg and looked at what they had been marching toward for eighteen days.
Nine miles of fortifications encircled the city’s landward approaches, a connected system of forts, redoubts, lunettes, and rifle pits with artillery covering every ravine an attacker might use. Grant ordered an assault on May 19th, half convinced Pemberton’s men were too broken to resist. He was wrong. The assault was repulsed with efficient violence, costing Grant close to a thousand men.
Three days later he ordered a full-scale coordinated assault along the entire line, both to take the city before Washington redirected part of his army to Louisiana and because he believed a simultaneous attack across nine miles of front would eventually find a soft spot. The assault lasted most of the day. At the railroad redoubt, men of the 13th Corps held a corner of the Confederate works from the outside for over two hours. At the second Texas lunette, Iowa volunteers planted their regimental colors in the ditch wall, and the men who planted them were shot, and more men came up to plant them again, and those men were shot too.
Grant’s casualties exceeded three thousand. He did not take the city. He settled in instead. With his supply line secured through the Yazoo River north of the city, Grant drew his siege lines and waited.
The logic was simple. He had seventy thousand men, supplies, and time. Pemberton had thirty thousand, none of those things, and a clock running against him with every meal his soldiers ate. Union engineers directed the digging of approach trenches, parallel lines running toward the Confederate works connected by zigzag saps that approached at oblique angles to prevent Confederate guns from firing down their length.
Soldiers who had never heard the word gabion learned to fill them with dirt. Men who had grown up on farms learned to push sap rollers, great cylinders of woven wickerwork, ahead of the digging parties to absorb fire. The work went on by day and night in heat that reached the nineties and did not relent. Every morning the Confederate fortifications were a few yards closer than they had been the evening before.
The Confederates pushed back with counter approaches and night raids, enfilading the Union trenches and dragging guns to new positions as the Union engineers found ways to neutralize their angles. Snipers, mortar rounds, and sharp skirmishes produced daily attrition on both sides. In places where the lines were close enough to hear each other, informal truces developed, soldiers agreeing on intervals when no one fired, when tobacco and newspapers crossed ground that was otherwise strictly lethal. Then the interval ended and they resumed trying to kill each other.
Inside the city, civilians had been adapting since before Grant arrived. By late May, much of Vicksburg had abandoned its homes for shelters cut into the hillsides, a network of cave dwellings ranging from simple holes to elaborate warrens with multiple rooms and carpeted floors. A physician’s wife named Emma Balfour recorded the siege in her diary with growing attention to food. The gap between her early entries and later ones tells the story more honestly than any official report.
Food became the defining reality. Pemberton had entered Vicksburg with roughly a month’s worth of full rations and immediately cut them to extend the timeline. By mid-June, a Confederate soldier received about four ounces of bacon and a quarter pound of cornbread per day. Then less.
Mule meat entered the diet. Rats, genuine city rats, were sold at market stalls. Pea bread made from ground cowpeas appeared as a cornmeal substitute and was eaten without comment because the alternative was nothing. By late June, Confederate surgeons noted that their patients’ wounds were not healing.
The soldiers in the works were losing weight visibly. They could still load and fire from fixed positions propped against the earthworks if they needed support. What they could not do by early July was anything requiring sustained movement. The option of breaking out had been consumed by the same biological clock consuming everything else.
Johnston’s relief army gathered northeast of the city, reaching roughly thirty thousand men. The theoretical plan, Johnston striking Grant from the rear while Pemberton sorted from the city, had the shape of military sense and none of its substance. Grant had been reinforced throughout June and had enough men to maintain the siege and hold a blocking force against Johnston simultaneously. Sherman commanded that blocking force and positioned it well.
Johnston looked at Sherman’s position and made the decision that defined him. He would not advance. His communications to Pemberton were models of strategic evasion, suggesting a breakout, hedging with conditions, withdrawing the conditions when pressed, and finally asking Pemberton to decide for himself whether a sortie was practicable. The army that was supposed to save Vicksburg spent July at a careful distance from it.
Thirty thousand Confederate soldiers were starving nine miles away, and Johnston had an army, and he did not move it. The surrender came in stages. On July 1st, Pemberton called his commanders together and asked whether the army could break out. The men who had been living in those trenches told him their soldiers were too weak to sustain a march under fire.
They could hold their positions for a time. They could not make the kind of mobile night attack a breakout required. Pemberton heard this from man after man. He thanked them and dismissed them.
On July 3rd, the same afternoon the survivors of Pickett’s division were walking back across the fields at Gettysburg, Pemberton sent a note through the lines requesting terms. Grant’s initial reply was unconditional and immediate surrender. Then he revised his position. He had roughly thirty thousand Confederate prisoners to process, and the infrastructure in Mississippi could not move thirty thousand men in any reasonable timeline.
He offered parole instead, releasing the Confederate soldiers on their word of honor not to fight until formally exchanged. He had opposed parole throughout the war on the grounds that Confederate soldiers violated it. He offered it anyway. Paroled soldiers walking home through the South were evidence of what had happened, thin and empty-handed, their condition drawing conclusions no newspaper could revise.
At ten o’clock in the morning on July 4th, 1863, the white flags went up along the Confederate works. Grant rode into Vicksburg on a chestnut horse. The Confederate soldiers came out of their fortifications and stacked their arms in long rows along the roads. The Union men who had spent forty-seven days in the opposing trenches watched them emerge in silence, not a triumphant silence but something more considered.
These were men who had held nine miles of earthworks for a month and a half against a superior force while slowly starving. Union soldiers passed food across before the formal ceremonies were complete. The date was not accidental. Grant had shaped the final negotiations partly to produce a surrender on the Fourth of July.
News arrived in Washington on July 7th, the same day Lincoln was still processing the dimensions of Gettysburg, and the combination of the two victories produced a political and psychological impact no single event could have generated alone.