For a very low casualty approach, all HA armies complemented by a few lancers and a unit or two of cannoniphants.

In a Turk game, the experienced siphais from numerous campaigns including against Mongols and Timurids arrive in the New World complemented by some newly hired cannoniphants. Bag and shoot. Then charge through. White flags everywhere.

Aztecs are ridiculously easy compared to Mongols or Timurids. Twas also great fun to stomp them with eles.