Metal Sonic Troopers

The 'Metal Sonic Troopers were an army of Metal Sonics created by Sir Charles Hedgehog and Rotor to defend Knothole against Dr. Eggman when Sonic was believed to be dead.

History
When Sonic went missing after the battle with the Xorda, King Maximillian Acorn commisioned Sonic's Uncle Chuck and Rotor to build an army of Metal Sonics to act as Knothole's defense after Sonic's supposed death, but the army was never used. Sometime later, a mysterious figure (who later turned out to be A.D.A.M.) activated the army and set it loose on both Knothole and Dr. Eggman. The army even injured Hope Kintobor during their assault, resulting in a fight between Sonic and Shadow, both blaming each other over her sustained injury. However, the army was defeated when Shadow used Chaos Control, completely destroying it. (StH: #157, #158, #159)

Background Information
The Metal Sonic troopers shared Metal Sonic's design from the videogame Sonic Heroes.