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 spring came on (681),
the besieged redoubled their exertions and took the trenches
constructed on Dindymon: nothing remained for the king but to raise
the siege and with the aid of his fleet to save what he could.
He went in person with the fleet to the Hellespont, but suffered
considerable loss partly at its departure, partly through storms
on the voyage. The land army under Hermaeus and Marius likewise
set out thither, with the view of embarking at Lampsacus
under the protection of its walls.
They left behind their baggage
as well as the sick and wounded, who were all put to death
by the exasperated Cyzicenes. Lucullus inflicted on them
very considerable loss by the way at the passage of the rivers
Aesepus and Granicus; but they attained their object. The Pontic ships
carried off the remains of the great army and the citizens of Lampsacus
themselves beyond the reach of the Romans.
