Mormoris and his army attacked the fortress of Nivice and finally captured it in 1571. Meanwhile, an Ottoman fleet under admiral Uluz Ali approached the coast of Himara. During his campaigns, Mormoris was helped by his brother Zorzis Mormoris who led units of "stratioti" in Margariti, Santa Maura (Lefkada), and Corfu. But Venice removed its support to the Greek rebels and so the rebels had to end their attack on Kardhiq and later Sopot Fortress was recaptured by the Ottomans in 1571. Emmanuel Mormoris was captured during the Ottoman attack, taken prisoner to Constantinople, and was freed in June 1575 during a prisoner exchange between the Venetians and Ottomans.