The answer is Mercenaries helped generals fight one another.
What do mercenaries mean in ancient Rome?
Mercenary, hired professional soldier who fights for any state or nation without regard to political interests or issues. From the earliest days of organized warfare until the development of political standing armies in the mid-17th century, governments frequently supplemented their military forces with mercenaries.
Why was the hiring of Germanic mercenaries by Western Roman emperors a mistake?
The Germanics were poor soldiers who could not handle Roman weapons. The Germanics lacked loyalty to Rome and sometimes fought against the empire. The regular Roman army rose up against the mercenaries and killed many of them.
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