Here's a real answer for you: While the Roman empire was very big and great and famous, no empire can sustain itself without backup. The Roman army is the "backup" for the empire. Without the army, any other country could take over the empire or destroy it, and the Romans would be unable to resist or put up a fight. And that's why all powerful nations and empires need armies. Of course, the Roman empire was TOO big, and the army was too small to secure the Roman empire's massive borders. Hope this helps!
The Roman Empire needed its army to survive for defense against invasions, control of territories, expansion, political stability, and economic growth. The army played a critical role in maintaining order and protecting the empire's vast borders against external threats. Without a strong military presence, the empire would have faced significant challenges to its existence and stability.
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