I concur - I tend to have a mobile stack of mounted thunderbraves sheparding a more HTH stack of Kotsienkos/Medicine Men/Ondes' Men/thunder braves with high star general. I still find it hard in big battles with mesoamericans - the sheer numbers makes them bloody affairs. Also - the Aztecs at the stage of game I'm in (VH/VH about turn 70 odd) have LOTS of stacks. I've counted around 20 full stacks of jaguars/eagle warriors coming my way.