General Don Carlos Buell, US Army officer, 1862-1867. Buell (1818-1898) was a general in the Union (northern) army in the American Civil War. After helping to organise the Armies of the Potomac and the Ohio, he commanded the Kentucky campaign against the Confederates under Braxton Bragg. Buell was relieved of his command after the Battle of Perryville for being too slow to pursue retreating enemy troops. An engraving from volume II of The War with the South : a History of the Late Rebellion, by Robert Tomes, Benjamin G Smith, New York, Virtue & Yorston, 3 Volumes, 1862-1867.