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Units with Trample inflict 5 + 2 * size of trampler untyped AP damage when moving through another unit. Trample ignores shields.
Then there is a check of the trampled unit's defence skill - (1 per 10 fatigue) vs 3d6 (exploding) to take only 1 damage1). The trampler wins ties. Weapon bonuses and penalties to defence skill are ignored, but armour is respected.
Trampling units only use their other attacks when meeting a unit of the same size or larger as themselves.
Trampling units can trample several squares per turn, the maximum amount is dependent on their combat speed.
Every square trampled costs full encumbrance in fatigue.
Trampling units can not be repelled but still have to test against awe.