Chattanooga Campaign
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| Chattanooga Campaign | |
|---|---|
| Name | Chattanooga Campaign |
| Partof | American Civil War |
| Date | September–November 1863 |
| Place | Chattanooga, Tennessee and vicinity |
| Result | Union strategic victory |
| Combatant1 | United States (Union) |
| Combatant2 | Confederate States (Confederacy) |
| Commander1 | Ulysses S. Grant, William S. Rosecrans, George H. Thomas, William T. Sherman, Joseph Hooker, Philip H. Sheridan |
| Commander2 | Braxton Bragg, James Longstreet, Patrick Cleburne, John C. Breckinridge, Daniel Harvey Hill |
| Strength1 | ~60,000–100,000 |
| Strength2 | ~40,000–50,000 |
Chattanooga Campaign
The Chattanooga Campaign was a critical series of operations in the western theater of the American Civil War during September–November 1863 that culminated in a decisive Union victory at Chattanooga, Tennessee. The campaign involved complex maneuvers and major engagements among principal commanders including Ulysses S. Grant, William S. Rosecrans, Braxton Bragg, and George H. Thomas, and set the stage for William T. Sherman's Atlanta Campaign and the broader Union advance into the Deep South. Control of rail junctions and river crossings around Chattanooga made the region strategically vital after the Union victory at Battle of Gettysburg and operations in Tullahoma Campaign and Battle of Chickamauga.
Background
Following the Tullahoma Campaign and the Union occupation of Tennessee, Braxton Bragg concentrated Confederate forces at Chattanooga to threaten Union control of key lines of communication, notably the Nashville and Chattanooga Railroad and the Chattanooga, Knoxville and Charleston routes. After the Battle of Chickamauga, William S. Rosecrans's Army of the Cumberland retreated to Chattanooga and became besieged by Bragg's Army of Tennessee, prompting political and strategic concern in Washington, D.C. and among senior officers such as Ulysses S. Grant and Abraham Lincoln. The loss of the initiative following Chickamauga, combined with Confederate efforts to sever Union supply via the Chattanooga Campaign (siege) logistics, made urgent relief necessary before winter and ahead of planned operations in Georgia.
Forces and commanders
Union forces in the theater included elements of the Army of the Cumberland, the Army of the Tennessee, and the Army of the Potomac detachments under leaders like George H. Thomas, William T. Sherman, Joseph Hooker, and subordinate generals such as James B. Steedman and Oliver O. Howard. Confederate forces centered on the Army of Tennessee commanded by Braxton Bragg with corps and divisions led by James Longstreet, Patrick Cleburne, John C. Breckinridge, and D. H. Hill (Daniel Harvey Hill). Strategic direction in Washington involved Ulysses S. Grant coordinating reinforcement assignments and political pressure from Abraham Lincoln and Edwin M. Stanton. The theater also saw involvement by cavalry leaders like Nathan Bedford Forrest and Union cavalry under David S. Stanley and William W. Averell.
Opening maneuvers and battles (September–October 1863)
After Rosecrans' retreat to Chattanooga following Battle of Chickamauga, Braxton Bragg moved to invest the city, contesting supply lines such as the Crib Gap approaches and the Brown's Ferry corridor. Union attempts to break the siege included reconnaissance and smaller actions along Lookout Mountain and the Tennessee River approaches. Skirmishes and demonstrations around Wauhatchie and Lookout Creek sought to secure communication lines and relieve the stranded Army of the Cumberland. Confederate efforts to exploit interior lines resulted in clashes at forward positions and defensive works near Missionary Ridge and Kennerdell's Station, as corps commanders maneuvered for advantage ahead of the crucial winter campaigning season.
Siege of Chattanooga and Union relief (November 1863)
Union supply shortages and isolation prompted Ulysses S. Grant to prioritize opening the "Cracker Line" into Chattanooga, assigning William T. Sherman and Joseph Hooker to coordinate relief operations. The Battle of Wauhatchie secured a nightly supply route across the Tennessee River, enabling the buildup of William S. Rosecrans's former forces now under George H. Thomas and reinforcements from the Army of the Potomac under Joseph Hooker. Confederate countermeasures by Braxton Bragg and James Longstreet attempted to interdict these lines, but Union engineering and river-borne logistics under John C. Pemberton-type coordination allowed steady resupply. The successful opening of supply and reinforcement corridors shifted operational momentum toward the Union armies.
Battles for Chattanooga and breakthrough
With supply lines secured, Ulysses S. Grant and subordinate commanders planned a coordinated assault: Joseph Hooker would seize Lookout Mountain, William T. Sherman would attack the northern end of Missionary Ridge, and George H. Thomas would assault the Confederate center. The Battle of Lookout Mountain (the "Battle Above the Clouds") saw Hooker dislodge Confederate positions, while Sherman's attacks fixed James Longstreet's attention on the ridge's northern approaches. On November 25, the Battle of Missionary Ridge produced a dramatic Union breakthrough when George H. Thomas's troops stormed Confederate entrenchments, routing Bragg's army and forcing a Confederate retreat toward Ringgold, Georgia and Chickamauga Station. The coordinated actions, including cavalry operations by leaders such as James H. Wilson and counterattacks by Confederate brigades under Patrick Cleburne, resulted in a decisive collapse of Confederate defensive lines.
Aftermath and strategic consequences
The Union victory relieved Chattanooga as a logistical hub and paved the way for William T. Sherman's Atlanta Campaign and subsequent operations in Georgia and the Deep South, including the March to the Sea campaign planning. Braxton Bragg's defeat precipitated leadership changes within the Confederate States Army, including Bragg's resignation and the reassignment of corps commanders such as James Longstreet to other theaters like the Bristoe Campaign-era maneuvering and Knoxville Campaign. The campaign solidified Ulysses S. Grant's reputation and influenced his subsequent promotion to general-in-chief, while bolstering Abraham Lincoln's strategic posture. Control of the railroads and river approaches at Chattanooga ensured Union dominance in the western theater and accelerated Confederate territorial losses through late 1863 and 1864.