kind of kurd is doing the fighting. the peshmerga from the kurdish regional government up in northern iraq, very clear they're leading this operation. we saw the occasional sign of all the kurdish groups somewhere in the area but not in evidence at all frankly. this was a peshmerga operation. it was always thought to be one. the americans who are clearly in the skies but according to them today when you talk to them on the ground, perhaps other western militaries too, advising this operation. they seem to be comfortable with the peshmerga because of their organization you get from them and certainly their ability to deliver on fielding large numbers of troops. enormous columns we saw piling down these main roads. not an unstoppable force but one that's pretty hard to argue with. clearly, the americans are comfortable with working alongside them and perhaps this, i think, is aimed at building some sense of momentum to perhaps ensure a quick victory in sinjar because raqqah and mosul, the real targets, are both east and west of there, maybe the beginning of something