Critical Thinking Questions   Map List       If you'd like to print out this page, click the Print button above. Alternatively, you may click the printer icon on your browser's toolbar, or choose File>Print from the menu.     1. During Augustus’s reign, the Germans managed to hold the territory beyond the Danube and Rhine rivers. In what ways did these rivers serve as defensible frontiers for the Germans? 2. In what ways could Roman emperors use the Mediterranean Sea to help hold the empire together? 3. After Augustus, several emperors enlarged the empire. Why would having more territory to rule and a longer frontier potentially deplete the resources of the empire?