| May 13, 1861 |
George McClellan [US] appointed Commander, Department of Ohio. The following day he is promoted major general, his rank in the Ohio militia. Only General-in-Chief Winfield Scott held a higher rank |
Ohio
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George McClellan |
| July 22, 1861 |
George B. McClellan [US] ordered to Washington to take command of the Army of the Potomac following the defeat at Bull Run |
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Army of the Potomac |
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George McClellan |
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Washington D. C. |
| July 23, 1861 |
Major General John Dix ordered to take command of the Department of Maryland; Brigadier General William S. Rosecrans ordered to take command of the Department of the Ohio |
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William S. Rosecrans |
| November 15, 1861 |
William Tecumseh Sherman is replaced by Don Carlos Buell at the head of the reorganized Department of Ohio. Sherman had assumed command as senior officer when Anderson was relieved of duty. |
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William Tecumseh Sherman |
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Don Carlos Buell |
| April 11, 1862 |
Halleck assumes personal command of the forces at Pittsburg Landing, the Army of the Tennessee and the Army of the Ohio |
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Henry Halleck |
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Army of the Tennessee |
| September 25, 1862 |
Don Carlos Buell arrives in Louisville, KY, beating Braxton Bragg to the Ohio River. |
Kentucky
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Braxton Bragg |
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Don Carlos Buell |
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Confederate Invasion of Kentucky |
| September 29, 1862 |
George Thomas offered command of the Army of the Ohio. He refuses, unaware that Abraham Lincoln had made the offer after receiving a plea for Thomas from 20 officers in the Army of the Ohio. |
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George Thomas |
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Confederate Invasion of Kentucky |
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Don Carlos Buell |
| October 8, 1862 |
Battle of Perryville
Braxton Bragg [CS] and Don Carlos Buell [US] fight the largest battle on Kentucky soil. The battle is generally regarded as a draw, although Buell claimed victory. Less than half of Buell's men participated because he did not know a major battle was taking place less than 2 miles from his headquarters |
Kentucky
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Braxton Bragg |
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Don Carlos Buell |
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Army of Tennessee |
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Philip Sheridan |
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Confederate Invasion of Kentucky |
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William Hardee |
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Simon Bolivar Buckner |
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Benjamin Franklin Cheatham |
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Leonidas Polk |
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Patrick Cleburne |
| October 24, 1862 |
The XIV Corps, better known as the Army of the Cumberland, is created from the Army of the Ohio. |
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Army of the Cumberland |
| May 4, 1864 |
The final Spring Campaign of the Civil War began as the Army of the Potomac crossed the Rapidan River in Virginia and three smaller armys (Ohio, Tennessee and Cumberland) pushed deeper into Georgia. |
Georgia Virginia
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Army of the Potomac |
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Army of the Cumberland |
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Army of the Tennessee |
Army of the Ohio
Don Carlos Buell organized the Army of the Ohio from distinct military divisions within the Department of the Ohio, which he was put in command of in November, 1861. The
Battle of Mill Springs was the first battle in which its men fought.
In February, 1862, Buell's Army of the Ohio moved south with
Ulysses S. Grant's Army of Tennessee, taking the city of Nashville, Tennessee, following the fall of
Fort Donelson. It was the first Confederate capital to fall under Union control. From Nashville, the Army of the Ohio moved south to the town of Savannah, Tennessee. When Grant awoke to the sound of battle on April 6, 1862, he issued orders to Buell's lead division, under the command of
William 'Bull' Nelson, to advance to Pittsburg Landing in support of the
Army of the Tennessee. Nelson would be the first of Buell's three divisions to arrive in support of Grant at the
Battle of Shiloh.
Following the advance on Corinth,
Mississippi, the Army of the Ohio was ordered east to take the important railroad hub of Chattanooga,
Tennessee. Braxton Bragg's renamed
Army of Tennessee beat Buell to the prize city because rear-area security problems and logistics slowed the Army of the Ohio to a crawl. Buell had spread his army in a line stretching more than 400 miles from Pikeville,
Kentucky to Battleground,
Alabama and learned first-hand the meaning of the old maxim, "Defend everything and you defend nothing at all."
Links appearing on this page:Alabama
Army of Tennessee
Army of the Tennessee
Battle of Mill Springs
Battle of Shiloh
Fort Donelson
Kentucky
Mississippi
Tennessee
Ulysses S. Grant
William 'Bull' Nelson
Civil War Encyclopedia >> Armies - Union
Army of the Ohio was last changed on - November 20, 2006
Army of the Ohio was added on - November 3, 2006