"Our bond is Iron, our will unbreakable, who will stand against us?" - Grommash Hellscream The Iron Horde is the name given to the new Horde created under the vision of Garrosh Hellscream after he escapes imprisonment at the hands of the Alliance, Horde, and pandaren and escapes through time. Garrosh Hellscream returns to the moment just before his father Grommash Hellscream drinks the blood of Mannoroth 35 years earlier with the intention of not only stopping their corruption and their enslavery to the dark legion (which ultimately leads to the destruction of their home world) but to also influence an outcome and path where the new Iron Horde (Pure Blooded and non corrupted Orcs) could lead a new era of Conquest. Garrosh equips the Iron Horde with technology from his time. His intent is to re-align the Dark Portal and bring this army into the present to crush his enemies. After Garrosh's death at the hands of Thrall, the Iron Horde would later fall under the effects of the Blood Curse that Gul'dan developed. When Kilrogg Deadeye was the first to drink the blood of Mannoroth and became corrupted, Gul'dan took control of the Iron Horde and imprisoned Grommash for refusing to accept the blood. World of Warcraft - Warlords Of Draenor