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
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Landing of Regulus in Africa
Notwithstanding its considerable loss, the Carthaginian fleet did not give up the protection of Africa, and with that view returned to the gulf of Carthage, where it expected the descent to take place and purposed to give battle a second time. But the Romans landed, not on the western side of the peninsula which helps to form the gulf, but on the eastern side, where the bay of Clupea presented a spacious harbour affording protection in almost all winds, and the town, situated close by the sea on a shield-shaped eminence rising out of the plain, supplied an excellent defence for the harbour.
They disembarked the troops without hindrance from the enemy, and established themselves on the hill; in a short time an entrenched naval camp was constructed, and the land army was at liberty to commence operations. The Roman troops ranged over the country and levied contributions: they were able to send as many as 20,000 slaves to Rome. Through the rarest good fortune the bold scheme had succeeded at the first stroke, and with but slight sacrifices: the end seemed attained. The feeling of confidence that in this respect animated the Romans is evinced by the resolution of the senate to recall to Italy the greater portion of the fleet and half of the army; Marcus Regulus alone remained in Africa with 40 ships, 15,000 infantry, and 500 cavalry. Their confidence, however, was seemingly not overstrained.
The Carthaginian army, which was disheartened, did not venture forth into the plain, but waited to sustain discomfiture in the wooded defiles, in which it could make no use of its two best arms, the cavalry and the elephants. The towns surrendered -en masse-; the Numidians rose in insurrection, and overran the country far and wide. Regulus might hope to begin the next campaign with the siege of the capital, and with that view he pitched his camp for the winter in its immediate vicinity at Tunes.
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Reference address : https://www.ellopos.net/elpenor/rome/3-02-war-rome-carthage-sicily.asp?pg=31