Among the dangerous military innovations of Marius threatening the Republic was which of the following?

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Marius's recruitment of destitute volunteers who swore an oath of allegiance only to him was dangerous because it created a large, loyal army that was more devoted to their commander than to the Republic itself. This undermined the traditional loyalty of the army to the Senate and People of Rome, and made it easier for ambitious individuals like Marius to seize power. The use of Greek mercenaries was not uncommon in the ancient world, and while it could be dangerous if they turned on their employers or had conflicting loyalties, it was not a new or innovative tactic. There is no evidence that Marius stole the state treasury's tax revenues to buy weapons.

Among the Dangerous Military Innovations of Marius Threatening the Republic