Thanks for the feedback, very nice of you to take time to write it!
Combat is quite much random, but not chaotic random. For every troop you get 1d6 dice and you compare the sum of your rolls to opponents rolls and bigger one wins the fight. if attacker wins, he has chance to loose 1 or 2 troops.
We have played on idea with weaker but faster troops and on BIG strong unit that takes one whole area (so not stackable, but STRONK).