These troops can fight in extra ranks, perhaps because they have been trained to do so, or because their sheer ferocity means they willingly trample their comrades in order to reach the foe.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
Fight in Extra Ranks (*)URL Copied!
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If a unit has this special rule then supporting attacks can be made by one more rank than normal for each number indicated in the bracket. This rule is cumulative with other sources of Fight in Extra Ranks.