Overview
The Siege of Vicksburg was the final major operation of Ulysses S. Grant’s campaign to capture Vicksburg, Mississippi, and gain control of the Mississippi River. The city stood on high bluffs protected by swamps, bayous, forts, and artillery, earning it the nickname “The Gibraltar of the Confederacy.” After several unsuccessful attempts to approach the city, Grant moved his army south along the western side of the Mississippi and crossed back into Mississippi at Bruinsburg.
Grant then moved inland instead of attacking Vicksburg immediately. On May 14, 1863, Union forces occupied Jackson, Mississippi, forcing General Joseph Johnston to evacuate. Grant turned west toward Vicksburg, where General John C. Pemberton tried to stop him. Grant defeated Pemberton at the Battle of Champion Hill (May 16, 1863) and the Battle of Big Black River Bridge (May 17, 1863). Pemberton then withdrew his army into Vicksburg.
Grant launched direct assaults against the Confederate defenses on May 19 and May 22. Both failed and caused heavy Union casualties. Rather than continue attacking the fortifications, Grant surrounded Vicksburg. On May 25, his soldiers started digging trenches and building defensive positions around the city.
Grant established a secure supply line while his army grew to nearly 75,000 soldiers. Inside Vicksburg, Pemberton’s roughly 30,000 soldiers and the civilian population suffered from a lack of food, disease, and constant Union bombardment. During the siege, residents dug more than 500 caves for protection from artillery shells.
On July 3, Pemberton asked Grant for surrender terms. Grant eventually agreed to parole the Confederate soldiers instead of taking nearly 30,000 prisoners. Pemberton surrendered Vicksburg on July 4, 1863. The victory gave the Union complete control of the Mississippi River, divided the Confederacy, and strengthened Grant’s reputation as a military commander. It was a major turning point in the Civil War.
Essential Facts
- Date: May 25–July 4, 1863.
- Location: Vicksburg, Mississippi.
- Participants: The United States of America (USA) and the Confederate States of America (CSA).
- USA Commanders: Ulysses S. Grant.
- CSA Commanders: John C. Pemberton.
- Who Won: The United States won the Siege of Vicksburg.
- Campaign: Vicksburg Campaign.
- Era:
Statistics
United States of America
- Casualties: 4,835, including 766 killed, 3,793 wounded, and 276 captured or missing.
- Forces Engaged: Army of the Tennessee.
- Troop Strength: Roughly 75,000.
Confederate States of America
- Casualties: 32,697, including 3,202 killed, wounded, or missing and 29,495 surrendered.
- Forces Engaged: Army of Mississippi.
- Troop Strength: Roughly 30,000.
Significance
The Siege of Vicksburg is important to American History because the Union victory gave Federal forces complete control of the Mississippi River. The victory divided the Confederacy and cut its eastern states off from territories in the American West, reducing Southern access to important agricultural supplies. Vicksburg surrendered on July 4, 1863, during a disastrous period that also included Confederate setbacks at Gettysburg, Helena, and in the Tullahoma Campaign. Grant’s victory also restored his military reputation and increased confidence in his leadership, influencing his later role in the war. It was a major turning point in the Civil War.
History
By late 1861, President Abraham Lincoln was pressuring Union commanders in the West to invade the South. On January 30, 1862, the Western Theater commander, General Henry Halleck, reluctantly approved Brigadier General Ulysses S. Grant’s request to attack Fort Henry on the Tennessee River. Eager to move, Grant left Cairo, Illinois, on February 2, with 15,000 soldiers, plus a flotilla of seven gunboats, commanded by United States Navy Flag Officer Andrew Hull Foote.
On February 6, Confederate Brigadier General Lloyd Tilghman surrendered Fort Henry after a seventy-five-minute bombardment by Foote’s gunboats. Following the surrender of Fort Henry, Grant turned his attention toward investing Fort Donelson, located just twelve miles east of Fort Henry on the Cumberland River. After a failed breakout on February 15, the Confederate commander of Fort Donelson, General Simon B. Buckner, surrendered Fort Donelson to Grant the next day.
With two of the three main rivers connecting the North and South under Union control, the Federals turned their attention to the Mississippi River. If the Union could gain control of the Mississippi, the Confederacy would lose easy access to supplies from the Gulf of Mexico and territories in the American West. Admiral David Farragut captured the port city of New Orleans on May 18, 1862, closing down Confederate access to the Gulf. In June, the Union tightened its grip on the Mississippi River when Federal forces captured the river city of Memphis, Tennessee. Nevertheless, the South still controlled traffic on much of the river because of its strong fortifications at Vicksburg, Mississippi.
Vicksburg Geography
Vicksburg sits on a high bluff on the eastern side of the Mississippi River, south of the mouth of the Yazoo River. Known as “The Gibraltar of the Confederacy,” the city seemed impregnable. The height of the cliff on which it sat protected it from amphibious assaults. To the north, nearly impenetrable swamps and bayous protected Vicksburg. To the east, a ring of forts, mounting 172 guns, shielded the city from overland assaults. The land on the Louisiana side of the river, opposite Vicksburg, was rough, etched with poor roads and many streams.
Grant Bypasses Vicksburg
In July 1862, President Abraham Lincoln summoned Major General Henry W. Halleck to Washington to serve as chief of all Union armies. Halleck’s departure left Major General Ulysses S. Grant in charge of operations in the Western Theater.
In December 1862, Grant launched the first of several unsuccessful attempts to capture Vicksburg. When spring arrived, he tried a new, more complicated plan. On March 29, 1863, Grant put part of his army to work constructing bridges, draining bayous, and building a road past Vicksburg on the west side of the Mississippi. By May 1, his army had recrossed the river at Bruinsburg, Mississippi, and established a base of operations at Port Gibson.
Grant Occupies Jackson, Mississippi
Before assaulting Vicksburg, Grant turned his attention to an army that General Joseph Johnston was assembling in Jackson, Mississippi, 40 miles east of Vicksburg. By May 14, 1863, Union soldiers overpowered Johnston’s rearguard as he evacuated Jackson in the face of Grant’s larger army. After ordering the destruction of anything in the city that could support the Southern war effort, Grant marched his army back toward Vicksburg.
Pemberton Fails to Halt Grant
On May 16, 1863, Lieutenant General John C. Pemberton, the Confederate commander of the Army of Mississippi, unsuccessfully tried to halt Grant’s advance on Vicksburg by attacking the Union army at the Battle of Champion Hill, 20 miles east of the city. The next day, the Confederates made another futile stand at the Battle of Big Black River Bridge. With no other options, Pemberton ordered his men to burn the bridges spanning the river, gather everything edible in their path, and retreat to the safety of Vicksburg.
Vicksburg Under Siege
Grant made two attempts to storm Vicksburg on May 19 and on May 22. Neither assault was successful, costing the Federals 639 killed, 3,277 wounded, and 155 missing men. Rather than suffer further Union casualties, Grant besieged Vicksburg. On May 25, the Army of the Tennessee started to dig in, creating entrenchments around the city.
A week earlier, on May 19, William T. Sherman’s cavalry had forced the Confederates to evacuate their gun battery at Hayne’s Bluff, enabling Grant to establish a direct supply line on the Mississippi River to feed, arm, and reinforce his army. As Grant’s forces swelled to nearly 75,000 men, Pemberton’s only hope for escape was the possibility of General Johnston raising an army and marching against Grant from the east. Johnston did not share the belief held by others about Vicksburg’s military importance, so help never came.
With no supplies coming into the city, citizens and soldiers alike suffered from a lack of food. Gradually, the poor diet led to the onset of diseases, including scurvy, malaria, dysentery, and diarrhea. To add to the misery, Union artillery batteries and Farragut’s gunboats on the river lobbed thousands of shells into the city, forcing citizens to dig and inhabit over 500 caves for shelter.
Pemberton Surrenders
On July 3, 1863, Pemberton asked Grant for terms of surrender. Initially, Grant proposed an unconditional surrender, as he had done at Fort Donelson. Upon further reflection, Grant decided that he did not want the burden of nearly 30,000 starving prisoners in poor health. Instead, he offered to parole all the Confederates, hoping they would not take up arms against the Union again.
On July 4, 1863, the opposing generals reached an accord, and Pemberton surrendered the city and his garrison. The Confederate government later challenged the terms of parole on technical issues, and some prisoners Grant paroled fought against the North at Chattanooga and during Sherman’s Atlanta Campaign.
Aftermath of the Siege
The surrender of Vicksburg was a significant turning point in the American Civil War. Before the campaign began, President Abraham Lincoln stated, “Vicksburg is the key. The war can never be brought to a close until the key is in our pocket.” Confederate President Jefferson Davis said, “Vicksburg is the nail head that holds the South’s two halves together.” Both were correct. Vicksburg’s fall gave the Union complete control of the Mississippi River, reestablishing trade through the Gulf of Mexico. It also severed the Confederacy’s connections with territories in the American West, denying the South essential agricultural supplies.
Darkest Two Days in Confederate Military History
Combined with Major General George G. Meade’s victory at Gettysburg (July 3), Confederate General Braxton Bragg’s retreat from Middle Tennessee at the conclusion of Major General William S. Rosecrans’ highly successful Tullahoma Campaign (July 3), and Major General Benjamin Prentiss’ triumph over Confederate troops in Arkansas at the Battle of Helena (July 4), Grant’s victory at Vicksburg completed the darkest two days in Confederate military history.
Grant’s success at Vicksburg also restored his reputation, which had suffered after the surprise Confederate attack at Shiloh. The renewed confidence in Grant would have a decisive impact on later events in the Eastern Theater and on the final chapters of the war.
Timeline
- 1862, July — President Abraham Lincoln called Henry Halleck to Washington, leaving Ulysses S. Grant in charge of operations in the Western Theater.
- 1862, December — Grant divided the Army of the Tennessee and launched his first attempt to capture Vicksburg.
- 1862, May 18 — Admiral David Farragut captured New Orleans, cutting off a major Confederate connection to the Gulf of Mexico.
- 1862, June — Union forces captured Memphis, Tennessee, strengthening Federal control of the Mississippi River.
- 1862, December 26–29 — Confederate forces won the Battle of Chickasaw Bayou.
- 1963, January 9–11 — Union forces won the Battle of Arkansas Post.
- 1863, March 11–18 — Confederate forces won the Battle of Fort Pemberton.
- 1863, March 29 — Grant ordered his troops to construct bridges and roads and drain bayous along the Louisiana side of the Mississippi River.
- 1863, April — Grant’s men completed a route through Louisiana that allowed the Army of the Tennessee to move south of Vicksburg.
- 1863, April 16 — David Dixon Porter led seven gunboats and three supply vessels past the Confederate batteries at Vicksburg.
- 1863, April 22 — Six additional Union vessels passed Vicksburg.
- 1863, April 29 — Confederate forces won the Battle of Grand Gulf.
- 1863, April 30 — Roughly 23,000 Union soldiers crossed the Mississippi River and landed at Bruinsburg.
- 1863, May 1 — Union forces won the Battle of Port Gibson.
- 1863, May 7 — Grant’s army of roughly 45,000 soldiers moved northeast toward Jackson in three columns..
- 1863, May 9 — Confederate Secretary of War James A. Seddon ordered Joseph E. Johnston to travel to Mississippi and take command.
- 1863, May 10 — John C. Pemberton ordered John Gregg to move his brigade from Jackson to Raymond.
- 1863, May 11 — Gregg’s brigade arrived at Raymond and prepared for battle.
- 1863, May 12 — Union forces won the Battle of Raymond.
- 1863, May 13 — Johnston arrived in Jackson and ordered Confederate forces to evacuate the city.
- 1863, May 14 — Union forces won the Battle of Jackson.
- 1863, May 15 — Grant’s army started marching west from Jackson toward Vicksburg.
- 1863, May 15 — John C. Pemberton moved from his defenses near Vicksburg and attempted to cut Grant’s supply lines.
- 1863, May 16 — Union forces won the Battle of Champion Hill.
- 1863, May 17 — Union forces won the Battle of Big Black River Bridge.
- 1863, May 19 — Grant launched his first assault on Vicksburg, while Union forces also forced the Confederates to evacuate their battery at Hayne’s Bluff.
- 1863, May 22 — Grant launched a second unsuccessful assault against Vicksburg.
- 1863, May 25 — Grant placed Vicksburg under siege, and the Army of the Tennessee started constructing entrenchments around the city.
- 1863, July 3 — Pemberton asked Grant for surrender terms.
- 1863, July 4 — Pemberton surrendered Vicksburg and its Confederate garrison to Grant.
AP US History
Definition
Siege of Vicksburg (1863) — The Siege of Vicksburg was a major Union victory during the Vicksburg Campaign and a turning point in the Civil War. Ulysses S. Grant defeated Confederate forces at Champion Hill and Big Black River Bridge before driving John C. Pemberton into Vicksburg. After Union assaults on May 19 and 22 failed, Grant laid siege to the city. Food shortages and constant bombardment weakened the defenders, and Pemberton surrendered on July 4, giving the Union complete control of the Mississippi River.
Alignment
The Siege of Vicksburg is part of the following AP US History sections:
