Who would win?

[Tarbicus]

I said 15+, which is 10 years shy of 25 years.

I don't know why you're posing the question, but if you don't like the answers you're getting don't ask the question in the first place.

Legionaries were probably just as capable as Spartan hoplites. Even Republican legions mashed the Macedonian phalanx. Taking flanking manoeuvres out of battle tactics is pointless and loads the question.

even if they had to do so with their bare hands,

One dead legionary was pulled off an enemy who was barely alive. The legionary's arms had been broken, and the injured adversary had had most of his face bitten off while they were on the ground still fighting. Don't lecture about legionaries being whimps.