Purveyances, the requisitioning of goods, increased the unpopularity of Charles' government in southern Italy and Sicily. His subjects were also liable to be forced to guard prisoners or lodge soldiers in their homes. The restoration of old fortresses, bridges and aqueducts and the building of new castles required the employment of craftsmen, although most of them were unwilling to participate in such lengthy projects. Thousands of people were forced to serve in the army in foreign lands, especially after 1279. Trading in salt was declared a royal monopoly. In December 1281, Charles again ordered the collection of the , requiring the payment of 150% of the customary amount.