Basicly just pick two types of warriors, their weapons, and the terrain. But you can't make the terrain only help one of them, cause thats cheap. And it can't be totally unfair, like Nazi's vs. Cavemen. And only one match per post, and no double post.
So, I'll start:
Anchient Egyptian Warrior vs. Aztec Warrior
Bow and Arrow vs. Tematlatl
Spear vs. Huitzauhqui
Bronze Scimitar vs. Macuahuitl