The challenged that I believed that remained for the Roman Empire was the army and defense and religion and morality. One of the main challenges that stayed was the northern frontier. Because of the German tribal leader Herrmann ambushed and destroyed the three Roman legions made Augustus abandon the campaign. This left a problem of border defense that bedeviled his successors. Even though Augustus had 300,000 men, it was barely enough to hold the line from the barbarians. But overtime, the provincials on the frontiers became Roman citizens who helped strengthen Rome’s defenses against the barbarians outside. Now the other problem I believe was the religion and morality because after a century of political strife and the civil war it had