Syrian opposition fighters are trying to hold their positions in key cities.
Al Jazeera managed to gain exclusive access to one rebel fighting group in Aleppo.
The rebels are making a stand in the neighbourhood of Karm El-Jabal but they are outnumbered by government forces and there are reports that Hezbollah troops may soon join the fight against them.
Al Jazeera's Azhar Sukri reports.
Source: Al Jazeera