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
Wars as they are called, of a similar character with those against the
Ligurians, were waged with the Corsicans and to a still greater extent
with the inhabitants of the interior of Sardinia, who retaliated for
the predatory expeditions directed against them by sudden attacks on
the districts along the coast.
The expedition of Tiberius Gracchus
against the Sardinians in 577 was specially held in remembrance,
not so much because it gave "peace" to the province, as because
he asserted that he had slain or captured as many as 80,000 of
the islanders, and dragged slaves thence in such multitudes to
Rome that "cheap as a Sardinian" became a proverb.