The Cyber Legions were fleets of spaceships commanded by the Cybermen. By the 52nd century, there were at least twelve Cyber Legions.
The Ninth Cyber Legion invaded London in 2012 and were destroyed by the Eleventh Doctor and River Song. (GAME: The Eternity Clock)
The Twelfth Cyber Legion was destroyed by the Eleventh Doctor, to make a point to the captors of his companion Amy Pond and her baby daughter, Melody, before he invaded the asteroid station Demons Run. (TV: A Good Man Goes to War)