Atlanta campaign


The Atlanta campaign was a series of battles fought in the Western Theater of the American Civil War throughout northwest Georgia and the area around Atlanta during the summer of 1864. Union Maj. Gen. William Tecumseh Sherman invaded Georgia from the vicinity of Chattanooga, Tennessee, beginning in May 1864, opposed by the Confederate general Joseph E. Johnston.
Johnston's Army of Tennessee withdrew toward Atlanta in the face of successive flanking maneuvers by Sherman's group of armies. In July, the Confederate president, Jefferson Davis, replaced Johnston with the more aggressive General John B. Hood, who began challenging the Union Army in a series of costly frontal assaults. Hood's army was eventually besieged in Atlanta and the city fell on September 2, setting the stage for Sherman's March to the Sea and hastening the end of the war.

Background

Military situation

The Atlanta campaign followed the Union victory in the Battles for Chattanooga in November 1863; Chattanooga was known as the "Gateway to the South", and its capture opened that gateway. After Ulysses S. Grant was promoted to general-in-chief of all Union armies, he left his favorite subordinate from his time in command of the Western Theater, William T. Sherman, in charge of the Western armies. Grant's strategy was to apply pressure against the Confederacy in several coordinated offensives. While he, George G. Meade, Benjamin Butler, Franz Sigel, George Crook, and William W. Averell advanced in Virginia against Robert E. Lee, and Nathaniel Banks attempted to capture Mobile, Alabama, Sherman was assigned the mission of defeating Johnston's army, capturing Atlanta, and striking through Georgia and the Confederate heartland.

Opposing forces

Union

At the start of the campaign, Sherman's Military Division of the Mississippi consisted of three armies:
  • Maj. Gen. James B. McPherson's Army of the Tennessee, including the corps of Maj. Gen. John A. Logan, Maj. Gen. Grenville M. Dodge, and Maj. Gen. Francis P. Blair Jr.. When McPherson was killed at the Battle of Atlanta, Maj. Gen. Oliver O. Howard replaced him.
  • Maj. Gen. John M. Schofield's Army of the Ohio, consisting of Schofield's XXIII Corps and a cavalry division commanded by Maj. Gen. George Stoneman.
  • Maj. Gen. George H. Thomas's Army of the Cumberland, including the corps of Maj. Gen. Oliver O. Howard, Maj. Gen. John M. Palmer, Maj. Gen. Joseph Hooker, and Brig. Gen. Washington L. Elliott. After Howard took army command, David S. Stanley took over IV Corps.
On paper at the beginning of the campaign, Sherman outnumbered Johnston 98,500 to 50,000, but his ranks were initially depleted by many furloughed soldiers, and Johnston received 15,000 reinforcements from Alabama. However, by June, a steady stream of reinforcements brought Sherman's strength to 112,000.

Confederate

Opposing Sherman, the Army of Tennessee was commanded first by Gen. Joseph E. Johnston, who was relieved of his command in mid-campaign and replaced by Lt. Gen. John B. Hood. The four corps in the 50,000-man army were commanded by:
  • Lt. Gen. William J. Hardee.
  • Lt. Gen. John B. Hood.
  • Lt. Gen. Leonidas Polk. When Polk was killed on June 14, Loring briefly took over as commander of the corps but was then replaced by Alexander P. Stewart on June 23.
  • Maj. Gen. Joseph Wheeler.
Johnston was a conservative general with a reputation for withdrawing his army before serious contact would result; this was certainly his pattern against George B. McClellan in the Peninsula Campaign of 1862. But in Georgia, he faced the much more aggressive Sherman. Johnston's army repeatedly took up strongly entrenched defensive positions in the campaign. Sherman prudently avoided suicidal frontal assaults against most of these positions, instead maneuvering in flanking marches around the defenses as he advanced from Chattanooga towards Atlanta. Whenever Sherman flanked the defensive lines, Johnston would retreat to another prepared position. Both armies took advantage of the railroads as supply lines, with Johnston shortening his supply lines as he drew closer to Atlanta, and Sherman lengthening his own.

Summary

Battles

Sherman vs. Johnston

Rocky Face Ridge (May 7–13, 1864)

Johnston had entrenched his army on the long, high mountain of Rocky Face Ridge and eastward across Crow Valley. Sherman had earlier decided to demonstrate against the strong Confederate position with the bulk of his force while he sent a smaller portion through Snake Creek Gap, to the right, to hit the Western & Atlantic Railroad at Resaca, Georgia. With sufficient men, the Union Army could cut off the Confederate lines of communication to the south and force Johnston to attack them or disperse his army traveling through the rough terrain to the east. The larger Union force engaged the enemy at Buzzard Roost and at Dug Gap drawing away their attention. In the meantime, the third column, under McPherson, passed unnoticed through Snake Creek Gap and on May 9 advanced to the outskirts of Resaca, where it found a small Confederate force entrenched. Fearing defeat, McPherson pulled his column back to Snake Creek Gap, which Sherman's orders gave him authority to do. On May 10, Sherman decided to take most of his men and join McPherson to take Resaca. The next morning, as he discovered Sherman's army withdrawing from their positions in front of Rocky Face Ridge, Johnston retired south towards Resaca. So began the first of a long series of flanking maneuvers by Sherman against Johnston; Sherman became so good at the tactic that his men boasted that Sherman "could flank the devil out of hell, if necessary." Johnston would be flanked out of every position he held until eventually relieved of command. The opportunity to destroy or disorganize the Confederates in the campaign's first battle, however, was missed.

Resaca (May 13–15)

Union troops tested the Confederate lines around Resaca to pinpoint their whereabouts. Full scale fighting occurred on May 14, and the Union troops were generally repulsed except on Johnston's right flank, where Sherman did not fully exploit his advantage. On May 15, the battle continued with no advantage to either side until Sherman sent a force across the Oostanaula River at Lay's Ferry, towards Johnston's railroad supply line. Unable to halt this Union movement, Johnston was forced to retire.

Adairsville (May 17)

Johnston's army retreated southward while Sherman pursued. Failing to find a good defensive position south of Calhoun, Johnston continued to Adairsville while the Confederate cavalry fought a skillful rearguard action. On May 17, Howard's IV Corps ran into entrenched infantry of Hardee's corps, while advancing about north of Adairsville. Three Union divisions prepared for battle, but Thomas halted them because of the approach of darkness. Sherman then concentrated his men in the Adairsville area to attack Johnston the next day. Johnston had originally expected to find a valley at Adairsville of suitable width to deploy his men and anchor his line with the flanks on hills, but the valley was too wide, so Johnston disengaged and withdrew.

New Hope Church (May 25–26)

After Johnston retreated to Allatoona Pass from May 19 to 20, Sherman decided that attacking Johnston there would be too costly, so he determined to move around Johnston's left flank and steal a march toward Dallas. Johnston anticipated Sherman's move and met the Union forces at New Hope Church. Sherman mistakenly surmised that Johnston had a token force and ordered Hooker's XX Corps to attack. This corps was severely mauled. On May 26, both sides entrenched.

Dallas (May 26 – June 1)

Sherman's army tested the Confederate line. On May 28, Hardee's corps probed the Union defensive line, held by Logan's XV Corps, to exploit any weakness or possible withdrawal. Fighting ensued at two different points, but the Confederates were repulsed, suffering high casualties. Sherman continued looking for a way around Johnston's line, and on June 1, his cavalry occupied Allatoona Pass, which had a railroad and would allow his men and supplies to reach him by train. Sherman abandoned his lines at Dallas on June 5 and moved toward the railhead at Allatoona Pass, forcing Johnston to follow soon afterward.

Pickett's Mill (May 27)

After the Union defeat at New Hope Church, Sherman ordered Howard to attack Johnston's seemingly exposed right flank. The Confederates were ready for the attack, which did not unfold as planned because supporting troops never appeared. The Confederates repulsed the attack, causing high casualties.

Operations around Marietta (June 9 – July 3)

When Sherman first found Johnston entrenched in the Marietta area on June 9, he began extending his lines beyond the Confederate lines, causing some Confederate withdrawal to new positions. On June 14, Lt. Gen. Leonidas Polk was killed by an artillery shell while scouting enemy positions with Hardee and Johnston and was temporarily replaced by Maj. Gen. William W. Loring. On June 18–19, Johnston, fearing envelopment, moved his army to a new, previously selected position astride Kennesaw Mountain, an entrenched arc-shaped line to the west of Marietta, to protect his supply line, the Western & Atlantic Railroad. Sherman made some unsuccessful attacks on this position but eventually extended the line on his right and forced Johnston to withdraw from the Marietta area on July 2–3.

Kolb's Farm (June 22)

Having encountered entrenched Confederates astride Kennesaw Mountain stretching southward, Sherman fixed them in front and extended his right wing to envelop their flank and menace the railroad. Johnston countered by moving Hood's corps from the left flank to the right on June 22. Arriving in his new position at Mt. Zion Church, Hood decided on his own to attack. Warned of Hood's intentions, Union generals John M. Schofield and Joseph Hooker entrenched. Union artillery and swampy terrain thwarted Hood's attack and forced him to withdraw with heavy casualties. Although he was the victor, Sherman's attempts at envelopment had momentarily failed.