The Ninth Sontaran Battle Fleet, or just Ninth Battle Fleet, was a Sontaran military fleet of ships during the Last Great Time War..
Commander Jask, General Stenk and Ensign Stipe were members of the Ninth Battle Fleet when they attempted to invade Drakkis using teleport limpets. (AUDIO: The Sontaran Ordeal)
The Ninth Sontaran Battle Fleet was later destroyed by the Master. (AUDIO: The Bekdel Test)
The Fleet may have been related to or the same as the Ninth Sontaran Battle Group. (TV: The Two Doctors)