3. in fidem acceptae: sc. sunt; ‘were taken under their protection’; i.e. they were made tributary.
Ch. 20.
11. Liburnās: sc. nāvēs; these were light vessels built after a model taken from the Liburnians, a sea-faring people that lived on the east coast of the Adriatic Sea.
12. Duilius: the victory of Duilius was due to a device by which he turned a naval battle into a land contest. His ships were furnished with grappling irons, by means of which he seized the ships of the enemy and then boarded them, when the Roman soldiers easily proved themselves superior to the Carthaginian mercenaries. It was the first naval victory the Romans had ever gained, and in honor of it a column was erected to the memory of Duilius.
17. possent: cf. pūgnāsset, Ch. 8.
19. inde ＝ ex his locis: ‘from these places.’
20. triumphum ēgit: ‘he celebrated a triumph.’
Ch. 21.
23. pūgnātum: sc. est; ‘they fought.’
victus est: ‘he (Hamilcar) was conquered.’