The Hammerfall Bunker drops from the sky. An armoured strongpoint the Chapter plants to anchor a firebase — a fortified redoubt built to hold a flank and pour fire onto the killing ground the enemy must cross.
The Imperial Fists player may place the Hammerfall Bunker anywhere in their own half of the board at deployment. It is impassable terrain granting full cover; up to two friendly fighters may begin the game garrisoning it, firing from within at +1 to hit and safe from being charged from more than one direction at once. A garrisoning fighter ignores the -1 penalty for firing at a target in cover — the bunker was built by the same hands that break fortresses, and it knows where the walls are thin.