Editing Joseph Hooker (section)

===Western Theater===
[[File: Mrs. Joseph Hooker (Olivia Groesbeck).jpg|thumb|Olivia Groesbeck Hooker]]
[[File: Hooker at Lookout Mountain.jpg|thumb|left|Hooker and his staff at Lookout Mountain]]
Hooker's military career was not ended by his poor performance in the summer of 1863. He went on to regain a reputation as a solid corps commander when he was transferred with the [[XI Corps (Union Army)|XI]] and [[XXII Corps (Union Army)|XII Corps]] of the Army of the Potomac westward to reinforce the [[Army of the Cumberland]] around [[Chattanooga, Tennessee]]. Hooker was in command at the [[Battle of Lookout Mountain]], playing an important role in [[Lieutenant general (United States)|Lt. Gen.]] [[Ulysses S. Grant]]'s decisive victory at the [[Battle of Chattanooga III|Battle of Chattanooga]]. He was brevetted to major general in the [[Regular Army (United States)|regular army]] for his success at Chattanooga, but he was disappointed to find that Grant's official report of the battle credited [[William Tecumseh Sherman]]'s contribution over Hooker's.

Hooker led his corps (now designated the [[XX Corps (Union Army)|XX Corps]]) competently in the 1864 [[Atlanta Campaign]] under Sherman but when [[Army of the Tennessee]] commander [[James B. McPherson]] was killed in July during the battles around Atlanta, Sherman appointed XI Corps commander [[Oliver O. Howard]] to command the army instead. Hooker was offended at this gesture as he outranked Howard and had blamed him for the defeat at Chancellorsville. He also had very poor relations with XII Corps commander [[Henry W. Slocum]] ever since that battle and Slocum was relieved at being reassigned and sent to command the [[Vicksburg, Mississippi|Vicksburg]] garrison. Sherman did not have a very positive opinion of Hooker and readily accepted his resignation. Upon hearing of Hooker's protests at being turned down for army command despite his seniority, Grant remarked "A major general is only entitled to command of a division." Hooker's biographer reports that there were numerous stories indicating that Abraham Lincoln attempted to intercede with Sherman, urging that Hooker be appointed to command the Army of the Tennessee, but Sherman threatened to resign if the president insisted. However, due to "obvious gaps" in the [[Official Records of the American Civil War|Official Records]], the story cannot be verified.<ref>Hebert, p. 285.</ref>

After leaving Georgia, Hooker commanded the [[Northern Department (Union Army)|Northern Department]] (comprising the states of [[Michigan]], [[Ohio]], [[Indiana]], and [[Illinois]]), headquartered in [[Cincinnati, Ohio]], from October 1, 1864, until the end of the war.<ref name=Eicher304/> While in Cincinnati he married Olivia Groesbeck, sister of [[U.S. Congressman|Congressman]] [[William S. Groesbeck]].