A group of defectors calling themselves the Free Syrian Army is attempting the first effort to organize an armed challenge to President Bashar al-Assad’s rule, signaling what some hope and others fear may be a new phase in what has been an overwhelmingly peaceful Syrian protest movement.

For now, the shadowy entity seems mostly to consist of some big ambitions, a Facebook page and a relatively small number of defected soldiers and officers who have taken refuge on the borderlands of Turkey and Lebanon or among civilians in Syria’s cities.