Though a cadre of ten can be found in Godsgrave, the mekwerk giants of the Iron Collegium are kept unfueled and unmanned, only to be operated in times of absolute crisis. Owing to Itreyan military might and the difficulties of assaulting Godsgrave by anything other than sea, the presence of the machines in the city is mostly ceremonial. In the last forty truedarks, Godsgrave's War Walkers have been activated precisely twice.
The first, during the overthrow of King Francisco XV - legionaries loyal to the monarchy attempted to storm the palace and rescue the king from his assailants when news of the uprising broke. The loyalist pilots (strictly a ceremonial position by that stage of the monarchy) surrendered once they realized that Francisco and his entire family were already dead.
The second incident commenced with three bottles of mid-shelf goldwine and a drunken boast to a would-be paramour, segued into a stumbling crash into the sixth Rib (which broke at the base and collapsed into the sea), and ended with a swift trial and an even swifter crucifixion for the young man involved.
And the paramour wasn't even all that interested in him.