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
The more glad the citizens had been at first after
Milo's arrival to be quit of the burdensome service of mounting guard,
the more unwillingly they now rallied to the standards of the king:
it was necessary to threaten the negligent with the penalty of death.
This result now justified the peace party in the eyes of all, and
communications were entered into, or at any rate appeared to have been
entered into, even with Rome.
Pyrrhus, prepared for such opposition,
immediately treated Tarentum as a conquered city; soldiers were
quartered in the houses, the assemblies of the people and the numerous
clubs (--sussitia--) were suspended, the theatre was shut, the
promenades were closed, and the gates were occupied with Epirot
guards.
A number of the leading men were sent over the sea as
hostages; others escaped the like fate by flight to Rome. These
strict measures were necessary, for it was absolutely impossible in
any sense to rely upon the Tarentines. It was only now that the king,
in possession of that important city as a basis, could begin
operations in the field.