The ambition of Dragut increased with his power, and he determined, following the example of the Barbarossas, to seize and hold some strong place of arms possessed of a commodious port in which he might be the supreme ruler. Accordingly, in the depth of winter in the year 1548, at a time which was, as we have pointed out, a close season for piratical enterprises, and during which attack from the sea was not expected, he collected all the corsairs whom he could gather, and fell upon the Spaniards on the coast of Tunis, at Susa, at Sfax, and at Monastir. These places had been taken from the corsairs in the previous summer by Andrea Doria; they formed a sort of regular battle-ground when the combatants were in want of something to do, and were held alternately by the King of Tunis, the Spaniards, and the corsairs. Dragut was well aware that as soon as the spring arrived he would be attacked; he also knew that the attack would come in sufficient force to drive him out, as none of these towns was really strong or easily defended; in consequence he concentrated his attention on the town of “Africa,” otherwise known as Mehedia, and in the Roman histories as Adrumentum. This great city lay some leagues to the east of Tunis on a tongue of land projecting into the sea; its fortifications were regular, its walls of great thickness, height, and solidity, and were strengthened by many towers and bulwarks; the guns were large, numerous, and in good condition. At the back of the town, on an eminence, stood a large fortress, the citadel of the place; the harbour was large and secure, with an inner basin forming a port for galleys; the entrance to this was closed by a strong chain. The sea washed the walls of the city; indeed, it was entirely surrounded, except where by a narrow neck of land it joined the shore. The inhabitants, natives of the place, had shaken off the yoke of the King of Tunis, and had formed themselves into a kind of independent republic. They admitted neither Turk nor Christian within their walls, trusting neither party, and fearing from them the fate which befell Susa, Sfax, and Monastir.