 Many of the captives from Castrogiovanni were sent to the Caliph Al-Mutawakkil, as a representation of Abbas ibn Fadhl's victory.In response, the Byzantine emperor sent a large force in 859–860 under Constantine Kontomytes, but the army and the fleet carrying it were defeated by Abbas.Byzantine reinforcements led many of the cities subjugated by the Muslims to revolt, and Abbas devoted the years 860–861 to reduce them.