 Hasan was charged with leading reinforcements from Ifriqiya (mostly Kutama Berbers), while his cousin Ahmad ibn al-Hasan al-Kalbi was charged with leading the naval part of the expedition.In the event, in December 971, two days before Ibn Ammar's arrival, the Qarmatians were defeated at Ayn Shams near Fustat.Hasan then led an army of 10,000 men into a brutal suppression of an anti-Fatimid rebellion that had broken out in the eastern Nile Delta during the Qarmatian invasion.