Missile cavalry is ideal against the Aztecs, preferably Heavy Missile Cavalry. If unavailable, just use good charger cavalry!
I utilised Boyar Sons to much effect against the Aztecs! You'd be surprised at the amount of damage a cavalry unit can do to an Aztec army. Remember, taking prisoners is far more effective than killing in combat, so chase down the routers in the case that they do muster enough strength to return to the battle!
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