 In 836, Abu'l-Aghlab launched fresh attacks.A Muslim force seized the fortress known in Arabic as Qastaliasali (probably Castelluccio on the island's northern coast), but were driven away by a Byzantine counter-attack.The Muslim fleet, under al-Fadl ibn Yaqub, raided the Aeolian Islands and seized a number of forts on the northern coast of Sicily, most notably Tyndaris.