The Barbarian tribes surrounding Rome constantly tried to attack and push its boarders back over the last few hundred years of its existence. The Roman armies, when not fighting each other for political control, had to run from boarder to boarder attempting to push the Barbarian advances back. Boarder running and constant warfare took a toll on the Roman army; it also stretched it pretty thin. By the end of Rome, the army was barely able to stall the advances of the hordes. If the army was not weakened by endless combat, it may have been able to keep the tribes from sacking and taking Rome; Rome may even have been able to last a few hundred more
The Barbarian tribes surrounding Rome constantly tried to attack and push its boarders back over the last few hundred years of its existence. The Roman armies, when not fighting each other for political control, had to run from boarder to boarder attempting to push the Barbarian advances back. Boarder running and constant warfare took a toll on the Roman army; it also stretched it pretty thin. By the end of Rome, the army was barely able to stall the advances of the hordes. If the army was not weakened by endless combat, it may have been able to keep the tribes from sacking and taking Rome; Rome may even have been able to last a few hundred more