Kentucky was a southern border state of key importance in the American Civil War. It officially declared its neutrality at the beginning of the war, but after a failed attempt by Confederate General Leonidas Polk to take the state of Kentucky for the Confederacy, the legislature petitioned the Union Army for assistance. Though the Confederacy controlled more than half of Kentucky early in the war, after early 1862 Kentucky came largely under U.S. control.

In the historiography of the Civil War, Kentucky is treated primarily as a southern border state, with special attention to the social divisions during the secession crisis, invasions and raids, internal violence, sporadic guerrilla warfare, federal-state relations, the ending of slavery, and the return of Confederate veterans.

Kentucky was the site of several fierce battles, including Mill Springs and Perryville. It was the arena to such military leaders as Ulysses S. Grant on the Union side, who first encountered serious Confederate gunfire coming from Columbus, Kentucky, and Confederate cavalry leader Nathan Bedford Forrest. Forrest proved to be a scourge to the Union army in western Kentucky, even making an attack on Paducah. Kentuckian John Hunt Morgan further challenged Union control, as he conducted numerous cavalry raids through the state.

Kentucky was the birthplace of Abraham Lincoln, his wife Mary Todd, and his southern counterpart, Confederate President Jefferson Davis. Lincoln had declared, early in the war, "I think to lose Kentucky is nearly the same as to lose the whole game", further stating that he hoped to have God on his side, but had to have Kentucky.

An estimated 25–40,000 Kentuckians served as Confederate soldiers, while 74–125,000 Kentuckians served as Union soldiers, including 24–25,000 Black Kentuckians, free and enslaved.Klotter in Kentucky's Civil War 1861–1865, p. 14.

Antebellum Kentucky

Kentucky's citizens were split regarding the issues central to the Civil War. In 1860, slaves composed 19.5% of the Commonwealth's population, and many Unionist Kentuckians saw nothing wrong with the "peculiar institution".Harrison, p. 1. The Commonwealth was further bound to the South by the Mississippi River and its tributaries, which were the main commercial outlet for her surplus produce, although railroad connections to the North were beginning to diminish the importance of this tie.Harrison, p. 2. The ancestors of many Kentuckians hailed from Southern states like Virginia, North Carolina, and Tennessee, but many Kentucky children were beginning to migrate toward the North.

Kentucky, along with North Carolina, also boasted the best educational systems in the South. Transylvania University had long been one of the most respected institutions of higher learning in the nation, and while its reputation had begun to fade by 1860, other Kentucky schools like Centre College and Georgetown College were gaining prominence.Klotter in Kentucky's Civil War 1861–1865, p. 13.

Politically, the Commonwealth had produced some of the country's best known leaders. Former Vice Presidents John C. Breckinridge and Richard M. Johnson both hailed from the state, as did Henry Clay, John J. Crittenden, John M. Harlan, U.S. President Abraham Lincoln, and Confederate President Jefferson Davis. However, by the time of the Civil War, Kentucky was in a politically confused state. The decline of the Whig Party, which Clay had founded, had left many politicians looking for an identity.Harrison, p. 4. Many joined the Democratic Party, a few joined the newly formed Republican Party, while still others associated with one of numerous minor parties such as the Know Nothing Party. In the 1860 presidential election, the Constitutional Union Party, with Tennessee-native John Bell as its presidential candidate and Massachusetts-native Edward Everett as its vice-presidential candidate, won the state. The party was composed mainly of former Whigs and Know-Nothings.Constitutional Union Party Retrieved March 29, 2016.

Kentucky was strategically important to both the North and South. The Commonwealth ranked ninth in population by 1860, and was a major producer of such agricultural commodities as tobacco, corn, wheat, hemp, and flax. Geographically, Kentucky was important to the South because the Ohio River would provide a defensible boundary along the entire length of the state.

Kentucky governor Beriah Magoffin believed that the rights of the Southern states had been violated and favored the right of secession, but sought all possible avenues to avoid it.Harrison, pp. 6–7. On December 9, 1860, he sent a letter to the other slave state governors suggesting that they come to an agreement with the North that would include strict enforcement of the Fugitive Slave Act, a division of common territories at the 37th parallel, a guarantee of free use of the Mississippi River, and a Southern veto over slave legislation.Harrison, p. 7. Magoffin proposed a conference of slave states, followed by a conference of all the states to secure these concessions. Due to the escalating pace of events, neither conference was ever held.

Magoffin called a special session of the Kentucky General Assembly on December 27, 1860, and asked legislators for a convention of Kentuckians to decide the Commonwealth's course regarding secession. The majority of the General Assembly had Unionist sympathies, however, and declined the governor's request, fearing that the state's voters would favor secession.Harrison in Kentucky's Civil War 1861–1865, p. 26. The Assembly did, however, send six delegates to a February 4 Peace Conference in Washington, D.C., and asked Congress to call a national convention to consider potential resolutions to the secession crisis, including the Crittenden Compromise, authored by Kentuckian John J. Crittenden.Harrison, p. 8.

When the General Assembly convened again on March 20, it called for a convention of the border states in the Kentucky capital of Frankfort on May 27, 1861. Again, the call went unheeded. Legislators also passed a proposed Thirteenth Amendment to the Constitution that would have guaranteed slavery in states where it was already legal.

President Lincoln recognized the importance of Kentucky when, in a September 1861 letter to Orville Browning,Brown, p. 79. he had written:

I think to lose Kentucky is nearly the same as to lose the whole game. Kentucky gone, we cannot hold Missouri, nor Maryland. These all against us, and the job on our hands is too large for us. We would as well consent to separation at once, including the surrender of this capitol.Harrison, p. 3.

War breaks out

On April 15, 1861, President Lincoln sent a telegram to Kentucky governor Beriah Magoffin requesting that the Commonwealth supply part of the initial 75,000 troops to put down the rebellion. Magoffin, a Southern sympathizer, replied "President Lincoln, Washington, D.C. I will send not a man nor a dollar for the wicked purpose of subduing my sister Southern states. B. Magoffin".Powell, p. 52. Instead, most Kentuckians favored John J. Crittenden's position that the Commonwealth should act as a mediator between the two sides. To that end, both houses of the General Assembly passed declarations of neutrality, a position officially declared by Governor Magoffin on May 20, 1861.

Both sides respected the Commonwealth's neutrality, but positioned themselves strategically to take advantage of any change in the situation. Union forces established Camp Clay in Ohio just north of the city of Newport, Kentucky, and Camp Joe Holt in Indiana opposite Louisville, Kentucky.Kleber, p. 192. Meanwhile, Confederate troops constructed Forts Donelson and Henry just across Kentucky's southern border in Tennessee, and stationed troops fewer than 50 yards from Cumberland Gap. Volunteers from the Commonwealth left the state to join up with whichever side they favored. Some covert recruiting also took place.Harrison, p. 9. Nearly 60 infantry regiments served in the Union armies versus just 9 in the Confederate. However, a rather large number of cavalry outfits joined the latter. John Breckenridge originally commanded the "Orphan Brigade" of the Army of Tennessee, consisting of the 2nd, 3rd, 4th, 6th, and 9th Kentucky Infantry. The brigade's nickname came about allegedly because the soldiers' home counties were occupied by Union troops for most of the war and they couldn't go home to them.

Realizing that neutrality was becoming less and less feasible, six prominent Kentuckians met to find some solution for a state caught in the middle of a conflict. Governor Magoffin, John C. Breckinridge, and Richard Hawes represented the secessionists' position, while Crittenden, Archibald Dixon, and S. S. Nicholas advocated the Northern cause. The sextet agreed only to continue the doctrine of neutrality, however, and called for the formation of a five-member board to coordinate the Commonwealth's defense.Harrison, p. 10. The General Assembly created the board on May 24 and vested in it supervision of the state's military, a power reserved in the Kentucky Constitution for the governor.

The Commonwealth's military forces, however, proved to be just as divided as the general populace. The State Guard, under the command of Simon B. Buckner, largely favored the Confederate cause, while the newly formed Home Guard were mostly Unionists. Several close calls almost started a conflict within the state, but Buckner successfully negotiated with Union general George B. McClellan and Tennessee governor Isham Harris to maintain the Commonwealth's neutrality through the summer.

Elections of 1861

The tide of public opinion was beginning to turn in Kentucky, however. In a special congressional election held June 20, 1861, Unionist candidates won nine of Kentucky's ten congressional seats. Confederate sympathizers won only the Jackson Purchase region,Harrison in Kentucky's Civil War 1861–1865, pp. 26–27. which was economically linked to Tennessee by the Cumberland and Tennessee Rivers.Kleber, p. 193. Seeing imminent defeat at the polls, many Confederate sympathizers boycotted the election; the total number of ballots cast was just over half the number that had been cast in the previous year's election.Harrison, p. 11. Governor Magoffin was dealt a further blow in the August 5 election for state legislators. This election resulted in veto-proof Unionist majorities of 75–25 in the House and 27–11 in the Senate.Harrison in Kentucky's Civil War 1861–1865, p. 27.

From that point forward, most of Magoffin's vetoes to protect southern interests were overridden in the General Assembly.Kleber, p. 603. After clashing with the Assembly for over a year on even the most trivial issues, Magoffin decided that resignation was his only option. Magoffin's lieutenant governor, Linn Boyd, had died in office, and Senate Speaker John Fisk, next in line for the governorship, was not acceptable to Magoffin as a successor. In an intricate plan worked out with the General Assembly, Fisk resigned as speaker and the Senate elevated Magoffin's chosen successor, James F. Robinson, to the post. Magoffin then resigned, promoting Robinson to governor, and Fisk was re-elected as Senate Speaker.

Almost immediately following the results of the 1861 election, William "Bull" Nelson established Camp Dick Robinson, a Union recruiting camp, in Garrard County. When Crittenden objected to this violation of Kentucky's neutrality, Nelson replied, "That a camp of loyal Union men, native Kentuckians, should assemble in camp under the flag of the Union and upon their native soil should be a cause of apprehension is something I do not clearly understand."Harrison, pp. 11–12. Governor Magoffin appealed to President Lincoln to close the camp, but he refused.Harrison, p. 12. Meanwhile, Confederate volunteers covertly crossed the Tennessee border and massed at Camp Boone, just south of Guthrie. Kentucky's fragile neutrality was nearing an end.