While based in Malta, the Order and its navy participated in a number of naval battles against the Ottoman Navy or the Barbary pirates. The Order sent a carrack and four galleys to support the Spanish Empire and its allies in the conquest of Tunis in 1535. It also participated in the Battle of Preveza (1538), the Algiers expedition (1541) and Battle of Djerba (1560), in which the Ottomans were victorious over the Christian forces.