In this Tuesday Feb. 26, 2013 file photo, A Free Syrian Army fighter steps out from a hole wall to observe the Syrian army forces base of Wadi al-Deif, at the front line of Maaret al-Numan town, in Idlib province, Syria. The rebels' capture of this strategic city was a key success in their advances in northern Syria against regime forces. But it's so far proven an incomplete victory. Maaret al-Numan remains a shell of a city. One major reason: Rebels have been unable to take a large regime military base on the edge of the city. Artillery fire from Wadi Deif and other nearby government strongholds regularly thuds into its largely empty residential buildings, while warplanes pound surrounding villages. The vast majority of the population has fled and it's too unsafe for them to return.