How the hell did a bunch of sand savages in Toyota pickup trucks accomplish all this so quickly?Fairly easy to 'splain...the ISIS group are more than willing to die for their cause; the Iraqi army are not willing to die for anything. Hence, the running shoe is the most important item of the Iraqi army.
Looks more and more like an inside job. Iraqi troops in some areas of Mosul were ordered by their officers to stack arms. Just as the NVA infiltrated cities in S. Vietnam, prior to Tet, ISIS has done the same thing, via Sunni surrogates, to collapse Iraq.
The whole thing is going up in smoke.