Type: General, Fighter
Source: Player's Handbook

You are trained in using your mount to knock down opponents.
Prerequisite: Ride 1 rank, Mounted Combat
Benefit: When you attempt to overrun an opponent while mounted, the target may not choose to avoid you. If you knock down the target, your mount may make one hoof attack against him or her, gaining the standard +4 bonus on attack rolls against prone targets. (see Overrun.)