In 1087, Genoese and Pisan fleets led by Hugh of Pisa and accompanied by troops from Pantaleone of Amalfi, Salerno and Gaeta, attacked the North African city of Mahdia, the capital of the Fatimid Caliphate. The attack, supported by Pope Victor III, became known as the Mahdia campaign. The attackers captured the city, but couldn't hold it against Arab forces. After burning of the Arab fleet in the city's harbor, the Genoese and Pisan troops retreated. The destruction of the Arab fleet gave control of the Western Mediterranean to Genoa, Venice, and Pisa. This enabled Western Europe to supply the troops of the First Crusade of 1096–1099 by sea.