The Eighth Sontaran Battle Fleet was a fleet of the Sontarans.
Members of the Eighth Sontaran Battle Fleet, including General Fesk attempted to become involved in the Last Great Time War but was destroyed by the Daleks. (AUDIO: The Eternity Cage) More members destroyed by Missy. (AUDIO: The Bekdel Test)
The Sontaran Kygon Brox and his retinue belonged to the Eighth Battle Fleet. (COMIC: The Instruments of War)