Trampling Charge: If the horse moves at least 20 ft. straight toward a creature and then hits it with a hooves Attack on the same turn, that target must succeed on a DC 14 Strength saving throw or be knocked prone. If the target is prone, the horse can make another Attack with its hooves against it as a Bonus Action.
Hooves: Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 2d6+4 bludgeoning damage.