In the late 19th-century, innovations in the band saw and logging railroad led to a logging boom in Southern Appalachia. With base camps at Smokemont, the Three M Lumber Company and later the Champion Fibre Company cut much of the Oconaluftee valley before its tract was bought out by the Great Smoky Mountains Park Commission in the 1930s. In 1925, a massive forest fire quickly swept across the dried brush left over from the extensive logging, scorching much of the southern slopes of the Smokies.