The Roman Empire was massive, there was not enough time or people to build a good wall around it, nor were there enough legionnaires to guard the borders. Rome tried using small walls and natural borders like the Rhine and Danube River but they knew it still was not enough. Legionnaires were so caught up is their salaries and if their leader had the throne, they began to lose focus of what they were supposed to do, protect Rome. Since the legions were not doing their job Rome hired Germanic mercenaries to fight for them, but instead they turned against them. The Germanic tribes invaded Rome and destroyed their aqueducts so the people had little to drink. When rivers like the Rhine and Danube Rivers, froze it allowed easy access for invaders. In 410 CE, the Germanic Chief Alaric and the Germanic tribes invaded Rome with that
The Roman Empire was massive, there was not enough time or people to build a good wall around it, nor were there enough legionnaires to guard the borders. Rome tried using small walls and natural borders like the Rhine and Danube River but they knew it still was not enough. Legionnaires were so caught up is their salaries and if their leader had the throne, they began to lose focus of what they were supposed to do, protect Rome. Since the legions were not doing their job Rome hired Germanic mercenaries to fight for them, but instead they turned against them. The Germanic tribes invaded Rome and destroyed their aqueducts so the people had little to drink. When rivers like the Rhine and Danube Rivers, froze it allowed easy access for invaders. In 410 CE, the Germanic Chief Alaric and the Germanic tribes invaded Rome with that