Can Mammoths trample horses?

[vfb]

Damage is only affected by size difference in that AP is reduced more for trampling larger opponents, so the total damage doled out by a single trample sequence will be less if the opponents are large.

Damage on a single successfully trampled unit is only determined by the size of the trampler, not the size difference.

[Knai]

Yes, but he AP value is very important, and what it actually works out to is more damage on smaller creatures are you rush them, with relative size pretty critical.