This is the same weapon referred to in the Empire Armies book as a cavalry hammer, the traditional armament of the Knights of the White Wolf. However, in this list some of the Knights of the White Wolf are on foot, so continuing to call it a cavalry hammer could get confusing! When a mounted model is using its White Wolf hammer, the cavalry hammer rules apply, namely +2 Strength bonus in the turn the model charges and +1 Strength the rest of the time. On foot the hammer is wielded differently, and so counts as a halberd instead. In either case the weapon requires two hands to use.