 Union General Henry Halleck, commander of all Union forces in the West, sent two divisions from General Ulysses Grant's army, stationed in Mississippi, to Buell.Confederate General John Hunt Morgan, of Lexington, Kentucky, managed to destroy the L&N railroad tunnel at Gallatin, Tennessee, cutting off all supplies to Buell's Union army.On September 5, Buell reached Murfreesboro, Tennessee, and headed for Nashville.