Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
When Metellus again took the field in 647, Jugurtha nowhere held
his ground against him; he appeared now at one point, now at another
far distant; it seemed as if they would as easily get the better of
the lions as of these horsemen of the desert. A battle was fought,
a victory was won; but it was difficult to say what had been
gained by the victory.
The king had vanished out of sight in
the distance. In the interior of the modern beylik of Tunis,
close on the edge of the great desert, there lay on an oasis
provided with springs the strong place Thala;(14) thither Jugurtha
had retired with his children, his treasures, and the flower of his
troops, there to await better times.
14. The locality has not been discovered. The earlier supposition
that Thelepte (near Feriana, to the northward of Capsa) was meant, is
arbitrary; and the identification with a locality still at the present
day named Thala to the east of Capsa is not duly made out.