The Battle of Jonesborough (August 31 – September 1, 1864) was fought between Union Army forces led by William Tecumseh Sherman and Confederate forces under William J. Hardee during the Atlanta campaign in the American Civil War. On the first day, on orders from Army of Tennessee commander John Bell Hood, Hardee's troops attacked the Federals and were repulsed with heavy losses. That evening, Hood ordered Hardee to send half his troops back to Atlanta. On the second day, five Union corps converged on Jonesborough (modern name: Jonesboro). For the only time during the Atlanta Campaign, a major Federal frontal assault succeeded in breaching the Confederate defenses. The attack took 900 prisoners, but the defenders were able to halt the breakthrough and improvise new defenses. Despite facing overwhelming odds, Hardee's corps escaped undetected to the south that evening.
Thwarted in his earlier attempts to force Hood to abandon Atlanta, Sherman resolved to make a sweep to the south with six of his seven infantry corps. His objective was to block the Macon and Western Railroad which was the last uncut railroad leading into Atlanta. Three corps from Sherman's army got within artillery range of the railroad at Jonesborough and Hood reacted by sending two of his three infantry corps to drive them away. While the fighting at Jonesborough was going on, two more Union corps blocked the railroad on August 31. When Hood found that Atlanta's railroad lifeline was severed, he evacuated the city on the evening of September 1. Atlanta was occupied by Union troops the next day and the Atlanta campaign was concluded. Although Hood's army was not destroyed, the fall of Atlanta had far-reaching political as well as military effects on the course of the war.
In the Atlanta campaign, William T. Sherman commanded the Military Division of the Mississippi, which included elements of three Union armies. At the start of the campaign, George H. Thomas led the Army of the Cumberland, James B. McPherson directed the Army of the Tennessee, and John Schofield commanded the Army of the Ohio. The death of McPherson at the Battle of Atlanta on July 22 led to significant changes. Sherman named Oliver Otis Howard, formerly the IV Corps leader, to replace McPherson. Joseph Hooker, the XX Corps, believed that he should have been chosen, so he resigned and was replaced by Henry Warner Slocum. David S. Stanley assumed command of IV Corps. Later, John M. Palmer asked to be relieved of command of XIV Corps and was replaced by Jefferson C. Davis. Just before Jonesborough, Grenville M. Dodge, who led the Left Wing of the XVI Corps, was wounded and replaced by Thomas E. G. Ransom. George Stoneman, Schofield's cavalry commander, was captured during a raid and his division wrecked.
Thomas' army consisted of Stanley's IV Corps, Davis' XIV Corps, Slocum's XX Corps, and the 1st, 2nd, and 3rd Cavalry Divisions led by Edward M. McCook, Kenner Garrard, and Hugh Judson Kilpatrick, respectively. Howard's army was made up of John A. Logan's XV Corps, Ransom's Left Wing of the XVI Corps, and Francis Preston Blair Jr.'s XVII Corps. Schofield's small army included XXIII Corps and the remnant of a cavalry division led by Horace Capron. At the beginning of August, Thomas' army numbered 45,000 troops, Howard's army counted 21,000 soldiers, and Schofield's army mustered 12,000 men. Blair's XVII Corps had only 6,400 soldiers left after suffering serious losses at the Battle of Atlanta. Sherman's forces numbered 85,000 soldiers at the most. According to Battles and Leaders, on August 1, Sherman's armies counted 75,659 infantry, 5,499 artillery, and 10,517 cavalry, for a total of 91,675. On September 1, they mustered 67,674 infantry, 4,690 artillery, and 9,394 cavalry, for a total of 81,758.
In May 1864, the Army of Tennessee under Joseph E. Johnston included three infantry corps, the Georgia militia under Gustavus Woodson Smith, a cavalry corps led by Joseph Wheeler and an independent cavalry division under William Hicks Jackson. At the start of the campaign, the infantry corps commanders were William J. Hardee, John Bell Hood, and Leonidas Polk. Polk was killed at Pine Mountain on June 14 and replaced by Alexander P. Stewart on July 7. Henry D. Clayton took command Stewart's former division. Meanwhile, Edward C. Walthall took over James Cantey's division and John C. Brown assumed command of Thomas C. Hindman's division. Johnston was replaced in army command by Hood on July 17. Stephen D. Lee took over Hood's former corps. William H. T. Walker was killed at the Battle of Atlanta and his division divided among the divisions of Hardee's corps.
Hardee's corps consisted of the divisions of William B. Bate, Benjamin F. Cheatham, and Patrick Cleburne. Lee's corps was made up of the divisions of Brown, Carter L. Stevenson, and Clayton. Stewart's corps included the divisions of Walthall, Samuel Gibbs French, and William Wing Loring. Wheeler's corps consisted of cavalry divisions led by William T. Martin, John H. Kelly, and William Y. C. Humes. Author Albert E. Castel estimated Hood's strength in August as 30,000 less than Sherman's, or about 55,000. Mark M. Boatner III estimated that Hood had 37,000 infantry and 5,000 Georgia militia at the start of August.
The Atlanta Campaign began in early May 1864 when Sherman's 100,000 men moved against Johnston's 62,000. During the campaign, both sides were reinforced. Union General-in-chief Ulysses S. Grant ordered Sherman, "to move against Johnston's army, to break it up, and to get into the interior of the enemy's country as far as you can, inflicting all the damage you can against their war resources". Atlanta was a critical Confederate railroad hub, manufacturing center, and supply point, so Sherman chose it as his objective. The major confrontations were the battles of Rocky Face Ridge on May 5–9, Resaca on 13–16 May, New Hope Church and Dallas on May 25–27, and Kennesaw Mountain on June 27. Johnston was driven steadily back toward Atlanta. Johnston was replaced by Hood after Sherman's forces flanked the Confederate army out its Chattahoochee River defenses on July 9. Hood attacked Thomas' army at the Battle of Peachtree Creek on July 20 and attacked McPherson's army at the Battle of Atlanta on July 22. Both assaults failed with heavy Confederate losses.
While occupying Decatur, Sherman's troops wrecked the Georgia Railroad which ran east from Atlanta to Augusta. Union cavalry under Lovell Rousseau joined Sherman's army after a successful raid to cut the Montgomery and West Point Railroad at Opelika, Alabama. By July 25, William Wierman Wright's railroad construction gangs rebuilt the Chattahoochie bridge and repaired the railroad as far as Sherman's camps. Sherman brought the Army of the Tennessee, now commanded by Howard, from the east side of Atlanta, to the west side. Sherman wanted Howard's army to cut the Macon and Western Railroad which ran south from Atlanta to Macon. On July 27, Sherman also ordered McCook's and Stoneman's cavalry to launch raids against the Macon railroad. Howard's army was blocked at the Battle of Ezra Church on July 28. However, Ezra Church was a Union tactical victory; while Union losses numbered 632, Confederate casualties were nearly five times greater.
The Union cavalry raids were a fiasco. McCook's cavalry reached Lovejoy's Station after destroying several hundred wagons on the way. His troopers temporarily damaged the railroad, but on their return route they were surrounded by Confederate cavalry at Newnan. In the Battle of Brown's Mill they escaped after sustaining a loss of 600 men. Stoneman was supposed to damage the railroad, but instead he rode to Macon in an attempt to liberate the Union captives at Andersonville Prison. His 2,200-man division was surrounded by three of Wheeler's brigades; Stoneman was captured with 700 men and his division dispersed. Kilpatrick's cavalry division, which previously guarded the railroad, was now brought forward. Sherman sent the XXIII and XIV Corps southward to cut the Macon railroad but this operation failed at the Battle of Utoy Creek on August 5–7. After Utoy Creek, Sherman tried to bombard Atlanta into submission with 20-pounder Parrott rifles from Francis DeGress' Battery H, 1st Illinois Artillery and three 4.5-inch Ordnance rifles. This plan also ended in failure on August 12 when two of the Parrotts burst and the Ordnance rifles ran out of ammunition.