Source: Warhammer Fantasy: 6th Edition

Excess Casualties
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It can sometimes happen that a unit causes more casualties than there are enemy models in base contact with it. When this happens, the excess casualties are removed as normal. This represents the attackers springing forward and following up their assault by striking over the fallen bodies of their foes. Such is the ferocity of their attack and the surprise caused by their success, the excess casualties are struck down where they stand and have no chance to attack back.

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