Initial postings At the start of the
Civil War, Buell sought an important command, but instead his friend
George McClellan emerged as the champion of the Union war effort. Buell himself was sent all the way out to California. After the Union defeat at Bull Run, McClellan summoned him back east where he was quickly promoted to brigadier general of volunteers, to rank from May 17, 1861. Buell received offers to take a command in Kentucky, but instead he stayed in Washington helping organize the nascent
Army of the Potomac and being appointed as a division commander. In November, McClellan succeeded Winfield Scott as general-in-chief of the Army, and decided to post Buell out west, dividing the trans-Appalachia theater between him and Maj. Gen
Henry Halleck. but at the same time, Halleck rose to department commander which made Buell subordinate to him.
Shiloh . At the start of April, Buell was ordered to reinforce Grant's Army of the Tennessee, then encamped at Pittsburg Landing next to the
Tennessee River. On the morning of April 6, the Confederates launched a surprise attack on Grant's army, beginning one of the largest and bloodiest battles of the war. After the Army of the Ohio arrived the next day, the combined Union forces repulsed the Confederates. Although Buell was the junior of the two generals in rank, he insisted that he was acting independently and would not accept orders from Grant. Buell considered himself the victor of
Shiloh and denigrated Grant's contribution, writing after the war that he had no "marked influence that he exerted upon the fortune of the day." Contemporary historians, such as Larry Daniels and
Kenneth W. Noe, consider that Grant actually saved himself by the conclusion of the first day of battle and that the rivalry between Grant and Buell hampered the conduct of battle on the second day. The commanders operated almost completely independently of each other and Buell "proved slow and hesitant to commit himself." Following Shiloh, Governor Johnson objected to Buell's plans to withdraw the Nashville garrison on the grounds that Confederate sympathy in the city was still strong. However, Halleck sided with Buell and insisted that all available troops in the department were needed for the assault on Corinth. Henry Halleck arrived in person to take command of Grant and Buell's armies. The combined Union force, 100,000 men strong, began an extremely sluggish pursuit against
P.G.T. Beauregard's
Army of Mississippi, which had retreated into northern Mississippi. Despite a more than 2-1 numerical advantage, Halleck moved slowly. However, Buell was even slower and quickly caught the ire of Halleck. During the march to Corinth, Buell took extensive pauses to repair the railroad lines and would not entertain suggestions of allowing his army to live off the land. To that end, he court-martialed Col.
John Turchin for allowing his soldiers to loot area homes. This action was not popular either with Buell's troops or the War Department, and President Lincoln ultimately overturned the verdict, while Turchin eventually got promoted to brigadier general. The
Siege of Corinth ended in the Confederates abandoning the city on May 25. Afterwards, Halleck split up the two armies and sent Buell eastward to capture
Chattanooga while Grant remained in the Corinth area. In July, Halleck was summoned back to Washington to replace George McClellan as commander-in-chief of all Union armies, thus effectively returning the two Western armies to independent action. Buell's advance towards Chattanooga nearly rivaled the earlier march on Corinth for sluggishness, with extensive pauses to stop and repair railroad lines. When
Nathan Bedford Forrest's cavalry then ransacked the Army of Ohio's supply lines, Buell all but terminated the effort to take Chattanooga. Thus after a busy winter and spring, activity in the Western theater during the summer of 1862 almost completely ground to a halt. On July 17, Buell was promoted to colonel in the regular army. The summer months were increasingly frustrating for the Army of the Ohio, which was averaging barely a mile a day. Bored soldiers took to uncontrollable looting of the countryside and harassment of slaves. These infractions in their turn were punished harshly by Buell and by mid-August, morale in the army had almost collapsed. Despite protests from the War Department to move faster, Buell insisted that he could not hold Chattanooga for any length of time without proper caution and preparedness. Grant, despite his professional rivalry following Shiloh, addressed these charges against Buell in his memoirs, writing:
Kentucky In September, Confederate armies under
Edmund Kirby Smith and
Braxton Bragg invaded Kentucky and Buell was forced to take action. Buell wired Halleck that he planned to march on
Louisville, but Halleck, already frustrated with his glacial movements in Tennessee, replied back that he did not care where Buell marched just as long as he was doing something to take the fight to the enemy. The Kentucky campaign did have the effect of re-energizing Buell's demoralized soldiers who were excited to finally be going somewhere and march into a state that had been mostly untouched by war. Louisville was occupied by the Army of the Ohio on September 25, but despite learning that Bragg's army was in nearby
Munfordville, Buell, convinced that he was outnumbered, declined to pursue Bragg. A single corps of Buell's army was attacked by Bragg at the
Battle of Perryville on October 8, 1862, while Buell, a couple of miles behind the action, was not aware that a battle was taking place until late in the day and thus did not effectively engage the full strength of his army to defeat the smaller enemy force. Buell was urged by his officers to counterattack the next day, but he refused on the grounds that he did not know exactly how many Confederates he was facing. By morning, Bragg ordered a retreat from the field. Although Perryville was tactically indecisive, it halted the Confederate invasion of Kentucky and forced their withdrawal back into Tennessee. Although the battle ended with the Union army in possession of the field, the Confederates had escaped to fight another day, and Buell had not engaged most of his army in spite of having nearly 60,000 men to face a mere 16,000 Confederates. Even some of Buell's own officers and enlisted men began suspecting him of disloyalty, in part because he was one of a handful of Union generals to have owned slaves prior to the war. An Indiana artillery officer wrote "After Perryville, I became convinced that the sooner Buell was relieved of command of the Army of the Ohio, the better." When President Lincoln urged an immediate pursuit of Bragg, he was told by Buell that the route directly south from Perryville into Eastern Tennessee was rough, wooded country with few roads and would be too difficult to maneuver through. He said that the only sensible route was to go back west to Nashville, then travel east across Tennessee to Chattanooga. Halleck wired Buell telling him "The president does not understand why we cannot march as the enemy marches, live as he lives, and fight as he fights, unless we admit that there is some inherent defect in our generals and soldiers." On October 24, Buell was relieved from command of the Army of the Ohio and replaced by Maj. Gen
William Rosecrans. A military committee investigated Buell's conduct during and after Perryville, but came to no conclusions, and Buell considered his reputation vindicated as he did not compromise his principles in waging war. After his dismissal, he was ordered to
Indianapolis to await future assignments, but none came. When Grant was appointed general-in-chief of the army in March 1864, he offered Buell a possible assignment but he refused to serve under either Sherman or
George Thomas on the grounds that he outranked both of them. In his memoirs, Grant called this "the worst excuse a soldier can make for declining service". On May 23, Buell's volunteer commission expired and he reverted to the regular army rank of colonel. Unable to tolerate this demotion, he resigned from the army on June 1. ==Later life and death==