3 Cannons   =  4 armies
  3 Soldiers  =  6 armies
  3 Horsews   =  8 armies
  3 Mixed     = 10 armies
We find this puts more emphasis on strategy.  Too often, with increasing
values, a 
weak player (or any player) can cash in for 30+ armies and turn the game
around by 
mere brute force rather than strategic play.
Mahlon