Driving Lance (3.5e Maneuver)

With a heaving lunge, you pierce through a foe, spearing both it and the enemy behind it.

As part of this maneuver, you make a single melee attack against an opponent. In addition, if the attack hits, and there is an enemy that you threaten who is behind the opponent, you may attack them as well. You do not make a new attack roll, but instead use the first one to determine if your attack hits. You still make a new damage roll (or rolls to confirm critical hits) for the second target.