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They are a stand alone army unto themselves. One that can either do well or get tabled with ease.
They can also be used as an allies army or ore usefully as a 1-3 formation and still allow you to use a 3rd army as an ally. This is ignoring the unbound style of army building as most players totally disdain that and to soneis about as common as a unicorn in a....well, a house in the red light district.

It takes skill to use them effectively and they are easily countered. Although if a player is shortsighted and doesnt think your bringing any armor so doesnt plan for it, it could be a much easier game for you.