What is the trampling formula?
The damage is (size of trampler*4) of armor piercing damage if the trampled unit misses his defence check (not counting shields, def 10 = about 50% chance). So a chariot will do about 16 points of armor piercing damage to about 50% of those it overran. However the trampled unit always takes at least 1 point of damage no matter what. Strength and Attack are not relevant when trampling. High size difference allows several tramplings in one turn.