The Sontaran martial year was a unit of time alternative to Earth years, used by the Sontarans.
In the Sontaran martial year 5709, the Fifth Doctor interfered in the Sontaran's conflict with the Rutans on Samur. (AUDIO: Heroes of Sontar) As Styre's torture reports were known, this was sometime after the year 16087. (TV: The Sontaran Experiment)
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