Surprised nobody posted the quote:

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• The assault tactics used by the Alpha Legion against the Paramar Terminus Complex involved the mass use of rapid-moving armoured spearhead columns, supported by mobile artillery and siege units. Often depicted in the popular conception of their Legion as a force which favoured infiltration and asymmetrical tactics over brute strength, the Alpha Legion's excellent record in the use of armoured warfare during the Great Crusade is often overlooked, but it would be this key expertise that would carry their victory in the 1st battle of Paramar.

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One of the things that FW like to do in their black books is cite the flexibility and immense size of the Legions. It's an intentional push back against the idea that some Legions only do one thing well. This is one such example of that.