I was watching a show on the History Channel that talked about Maya warfare and the weapons they used. Consider this: do you think the Maya, a stone age civilization with no metal weaponry (but had some nasty hand-to-hand combat weapons) could go head-to-head with Roman soldiers and possibly give them a run for their (the Romans) money?
The Maya had some pretty amazing weapons such as clubs lined with sharpened obsidian and an axe that was both a tool and a weapon. They also had spears and other stuff too.
The Romans had spears, large knives, and swords. They also had armor, something that the Maya didn't have.
What are your thoughts? Consider also fighting tactics as well as motivations for fighting and/or waging war.
更新1:
There are several good answers here and I just can't pick one so I'm putting it to a vote.