From Wikitroid, the Metroid wiki

The Ing Horde was the name for the government and army of the Ing. It was run by the Emperor Ing. It was obliterated by Samus Aran and is depicted in Metroid Prime 2: Echoes, when Dark Aether was destroyed. The Horde's army was enormous encompassing anything from rogue Quad robots to Dark Splinters to Warrior Ing.