Foundry/1.03

Dwarf
For the most part of the game, Foundries will be the heart and soul of the Dwarven base. Whether it's through upgrading their units, producing (siege)weapons of mass destruction or pumping out Smiths to fill mines, the Foundry will certainly have a lot to do. So much in fact that you'll likely need to build at least couple of these right from the start of the game. By late game, once the Dwarves' mines are filled and the upgrades researched, the Foundries' workload starts to slack off, with Siege Weapon production being their only common use. Just remember to keep a good clearance of space around them to allow those Siege Weapons to freely move around your base without getting stuck.