The iron army (also known as the iron legions)[1] is the name of the combined forces of the iron dwarves, iron vrykul, and iron giants, forged by the Fire giants, Fjorn[2], Volkhan and Ignis the Furnace Master.
They are led by Loken[1] and the Assembly of Iron[3], for the purpose of conquering Azeroth in Yogg-Saron's name[4].