confined the besieged to the city itself, sought totally to cut off their intercourse with the outer world. He took up his head-quarters on the ridge by which the Carthaginian peninsula was connected with the mainland, and, notwithstanding the various attempts of the Carthaginians to disturb his operations, constructed a great camp across the whole breadth of the isthmus, which completely blockaded the city from the landward side. Nevertheless ships with provisions still ran into the harbour, partly bold merchantmen allured by the great gain, partly vessels of Bithyas, who availed himself of every favourable wind to convey supplies to the city from Nepheris at the end of the lake of Tunes; whatever might now be the sufferings of the citizens, the garrison was still sufficiently provided for. Scipio therefore constructed a stone mole, 96 feet broad, running from the tongue of land between the lake and gulf into the latter, so as thus to close the mouth of the harbour. The city seemed lost, when the success of this undertaking, which was at first ridiculed by the Carthaginians as impracticable, became evident. But one surprise was balanced by another. While the Roman labourers were constructing the mole, work was going forward night and day for two months in the Carthaginian harbour, without even the deserters being able to tell what were the designs of the besieged. All of a sudden, just as the Romans had completed the bar across the entrance to the harbour, fifty Carthaginian triremes and a number of boats and skiffs sailed forth from that same harbour into the gulf--while the enemy were closing the old mouth of the harbour towards the south, the Carthaginians had by means of a canal formed in an easterly direction procured for themselves a new outlet, which owing to the depth of the sea at that spot could not possibly be closed. Had the Carthaginians, instead of resting content with a mere demonstration, thrown themselves at once and resolutely on the half-dismantled and wholly unprepared Roman fleet, it must have been lost; when they returned on the third day to give the naval battle, they found the Romans in readiness. The conflict came off without decisive result; but on their return the Carthaginian vessels so ran foul of each other in and before the entrance of the harbour, that the damage thus occasioned was equivalent to a defeat. Scipio now directed his attacks against the outer quay, which lay outside of the city walls and was only protected for the exigency by an earthen rampart of recent construction. The machines were stationed on the tongue of land, and a breach was easily made; but with unexampled intrepidity the Carthaginians, wading through the shallows, assailed the besieging implements, chased away the covering force which ran off in such a manner that Scipio was obliged to make his own troopers cut them down, and destroyed the machines. In this way they gained time to close the breach.