 In 1527 Terni was used a camp of the Landsknecht army that would subsequently take part in the Sack of Rome and fought at Spoleto and Todi, where the League of Cognac troops were located.Before the late-19th century industrial development, Terni was a small center with some 15,000 inhabitants in 1881.In 1921 it had grown to 40,000 inhabitants.