There is no "siege" in Fallujah. [Al-Fadhily] is referring here to the hard perimeter around the city manned by Iraqi Police who prevent non-residents from bringing their cars in. It's an extreme measure, no doubt about it. But it keeps the car bombers and weapon smugglers out. Iraqis who live in Fallujah are free to come and go as they please. The non-resident vehicle ban is a defensive measure, like a national border or castle moat. Its purpose is to prevent a siege from the outside. . . .
1. the act or process of surrounding and attacking a fortified place in such a way as to isolate it from help and supplies, for the purpose of lessening the resistance of the defenders and thereby making capture possible.
In other words, a moat is exactly the sort of defense that turns an assault into a siege. This right-wing freak didn’t even bother looking up the word in a dictionary, or he could have argued on technical grounds that Fallujah wasn’t under siege because after it had been put under siege-like conditions the would-be assaulters had gone away rather than prepare to capture the city.