"Snape, can you find the wizard out there who animated them?" Peasegood asked, deflecting a hailstorm of spells that made it through a gap of the Inferi. The goblins are using the dead as shields to attack us, those bastards! I then realized the implication of the Hit Wizard's words. Either the goblins had been prepared for a long time to do this and knew exactly how to raise the dead as Inferi, or they have Wizards, possibly rogue Death Eaters, helping them attack the Ministry.