Syria: Rebels unveil home-made Volcano cannon
and other improvised weapons

"Lacking the resources of Assad's government forces, rebels have had to improvise weapons. Mortar shells are turned on lathes in factories and fired using a variety of improvised launchers. Homemade grenades are launched from giant catapults or customised shotguns. In this gallery we look at some of the homemade munitions used by the Free Syrian Army."
It isn't the Saudis and the Americans fighting a proxy war, it's David v Goliath.