Sadr's people went to Falluja just for weapons, they didn't stay. BTW most of the c-4 car bomb explosives and IED's throughout Iraq came from Fallujah. The IED ordnance was being dug up by locals from where Saddam's army buried them outside Al Taqaddum air base and sold in Fallujah. The Marines stopped all of that.
That is a HUGE victory by the Marines.