Nevertheless, in the summer of 920 al-Qa'im was able to capture the Fayyum Oasis, and in the spring of 921 extend his control over much of Upper Egypt as well, while Mu'nis avoided an open confrontation and remained at Fustat. During that time, both sides were engaged in a diplomatic and propaganda battle, with the Fatimids' in particular trying to sway the Muslim populace on their side, without success. The Fatimid expedition was condemned to failure when Thamal's fleet took Alexandria in May/June 921; when the Abbasid forces moved on Fayyum, al-Qa'im was forced to abandon it and flee west over the desert.