Cockburn, the author of The Occupation: War and Resistance in Iraq, writes, "Aside from wholly Kurdish units the Iraqi government's own security forces are thoroughly infiltrated" with insurgents.
This is as true in Mosul as it is in Baghdad. Insurgents have infiltrated Mosul's U.S.-trained police force and operate a "shadow" government that engages in assassination and intimidation tactics, which have already led 70,000 Kurds to flee the city. Writing that it is "allegiance not training, equipment and numbers that determines the effectiveness of the Iraqi security forces," Cockburn aims to dispel the notion that sectarian politics are any sunnier outside of Baghdad.
Read "The Shattering of Mosul" here.