 After some unfruitful ravages in Tuscany and Umbria, he began to seek for a diplomatic settlement with the pope.In September they signed a treaty by which della Rovere was relieved of all ecclesiastical censures and was left free to retreat to Mantua with all his artillery, as well as the rich library collected in Urbino by the former duke Federico III da Montefeltro.The war saw the first appearance of Giovanni dalle Bande Nere on the battlefield.