Battle of Mill Springs in the context of "George Henry Thomas"

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.