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extremists with their cheap weapons and volunteer army. cnn's nick paton walsh live in baghdad for us. >> near fallujah held by isis the center of the current government advance against them. so much lives being lost there, so much bloodshed. but at the same time the southwest of that key city there are sunni tribesmen, isis are also sunnis but these are moderates who oppose them struggling to get the weapons they need to hold isis off. >> the sandbags exactly what iraq needs to stay to the as a country. meters away you can glimpse the flag of isis extremists from iraq's sunni minority. but holding them off here the men the u.s. says are key to victory. moderate iraqi sunnis who will die to rid their hometown of isis. >> if america is to send help to the sunni tribes to anbar here is where it is most badly