Suleiman I policy of expansion throughout the Mediterranean basin was however halted in Malta in 1565. During a summer-long siege which was later to be known as the Siege of Malta, the Ottoman forces which numbered around 50,000 fought the Knights of St. John and the Maltese garrison of 6000 men. Stubborn resistance by the Maltese led to the lifting of the siege in September. The unsuccessful siege (the Turks managed to capture the Isle of Gozo together with Fort Saint Elmo on the main island of Malta, but failed elsewhere and retreated) was the second and last defeat experienced by Suleiman the Magnificent after the likewise inconclusive first Ottoman siege of Vienna in 1529. Suleiman I died of natural causes in his tent during the Siege of Szigetvár in 1566. The Battle of Lepanto in 1571 (which was triggered by the Ottoman capture of Venetian-controlled Cyprus in 1570) was another major setback for Ottoman naval supremacy in the Mediterranean Sea, despite the fact that an equally large Ottoman fleet was built in a short time and Tunisia was recovered from Spain in 1574.