Mosul is as the Iraqi capital of the militant group Islamic State. Out of a population of between 1.5 million and 2 million, 4,000 to 8,000 are armed extremists. They now face a combined military force in the tens of thousands, backed up by some of the world's great military powers, including the United States.
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Will the recapture of Mosul lead to peace or a bloodbath?