Mazalquivir
Hassan Pasha, instructed by the Sultan Suleiman, assembled soon an army of 100,000 men among Turks, Algerines, and a large number of Janissaries. This army was supported by sea by a fleet of 30 galleys, 5 French carracks, and 15 small vessels under the command of Jafar Catania, governor of Tlemcen. With these forces Hassan went to Mers El Kébir, stronghold whose dominion he considered essential to capture Oran. Meanwhile, Alonso and Martin de Córdoba had received supplies, gunpowder, tools, and a few soldiers from Málaga. To hold together both towns in order to help each other, they decided built two forts: "San Miguel", located on the hill that separated Oran from Mers El Kébir, and "Todos los Santos", facing the second town.