Don Carlos Buell (1818-1898) was a U.S. military officer who served as a Union major general during the Civil War (1861-65). A veteran of the Mexican-American War (1846-48), Buell entered the Civil War in 1861 and was instrumental in training the famed Army of the Potomac. As commander of the Army of the Ohio, Buell played a key role in the Union victory at the bloody Battle of Shiloh in April 1862. Later that year Buell moved his army into Kentucky to confront Confederate forces under the command of Generals Braxton Bragg and Edmund Kirby Smith. After occupying Louisville, Buell succeeded in halting Bragg’s advance at the inconclusive Battle of Perryville in October. Buell was criticized for his sluggish pursuit of Bragg’s retreating forces, and he was subsequently replaced by General William S. Rosecrans in October 1862. After the Civil War Buell worked as president of an iron company and as a pension agent. He died in 1898 at the age of 80.