Mercenary Companies and the Decline of SienaAmong the most dramatic problems faced on the Italian peninsula in the fourteenth century were the raids of marauding mercenary companies. These companies, known locally as Companies of Adventure and more generally as Free Companies, were private armies, composed of professional soldiers and adventurers from throughout Europe. They sold their services to the highest bidder in times of war, and staged ruinous raids in times of peace. The city of Siena,