Destroy the Forges!

Objectives
Destroy the North Lightning Forge, the Central Lightning Forge, and the South Lightning Forge with Bouldercrag's Bombs, then return to Bouldercrag the Rockshaper at Bouldercrag's Refuge.
 * North Lightning Forge damaged
 * Central Lightning Forge damaged
 * South Lightning Forge damaged

Provided Item:

Bouldercrag's Bomb

Description
In my folly, I'd thought Valduran's project at Narvir's Cradle, a large construction area to the south, no more than a grotesque monument to "Keeper" Loken's cruelty.

Now we know the truth, that it was meant to be used as a weapon against us and our allies. We must not allow this iron colossus to reach completion,, for it will mean the end of the refuge.

Go to Narvir's Cradle, find the lightning forges the stormforged artisans use, and sabotage them.

Progress
Were you able to hamper them by sabotaging the forges?

Completion
Excellent work! Oh, it won't stop the iron dwarves, but it'll take them valuable time to rebuild those forges. I daresay we've gained the advantage.