The XVIe century which saw the expansion of the Ottoman Empire in eastern Mediterranean, propels the small town of Algiers to the rank of capital regency and military bastion of the Sublime Porte, on the Maghreb coast, facing the hegemony of the Spanish Empire. the Ottomans who transform it into warrior city, creates an artificial port, equipped with new ramparts and establish around it a network of points of fortification, which quadrille the territory and supervise the province . Between 1516 and 1830, Algiers which is called al Mahrussa (well kept)) remains impregnable by the sea. Its permanent concern for protection is to show the strengthened and continual maintenance of its fortifications. In june 1830, french occupation was possible by landings the army at the western end of the bay, avoiding the defenses of the city.