The power of a tier7 attack

In the absence of the forger king at the heart of the fortress, the chain of command fell to his two most trusted underlings Brokk and Eitri who were veterans in the dwarven army, responsible for initiating the countermeasures from here on forward. 

They began activating the fortress's defence mechanisms, hidden beneath the mountainous terrain. Gates carved out of the bedrock closed off sections of the fortress, forcing the invading army into a narrower battlefield that favoured the stout dwarves.