From the campaign:
We want to raise funds to create as big Steam Dwarfs army as possible. The core of Metal Beards host consists of light armoured warriors, called Anvilborn, supported by crossbowmen and gunners. However, the light armour of a Anvilborn is more like a heavy armour for a human, and their crossbow is basically a small bolt thrower. When the Forge Gate doors, known as The Passage, are swung open, the countless Metal Beards march, rank after rank.