Alleghany County, with an area of 458 square miles, was formed in 1822 from Bath, Botetourt, and Monroe and was named for the Alleghany Mountains. At Fort Mann in this county, a battle took place in 1763 between settlers and Indians led by Cornstalk. Rockbridge County, with an area of 616 square miles, was formed in 1778 from Augusta and Botetourt and was named for the Natural Bridge. Samuel Houston and Cyrus H. McCormick were born in this county. Robert E. Lee and Stonewall Jackson are buried in Lexington, where Washington and Lee University and the Virginia Military Institute are located.