(CBS News) Iraqi forces are now on the edge of Mosul’s historic old town - one of the extremists’ last strongholds

ISIS fighters are being killed and rounded up as prisoners.

But even as they lose on the battlefield, they’re still waging an online propaganda war, painting themselves as a band of holy warriors.

One ISIS defector, who met with CBS News correspondent Holly Williams in Turkey, showed just how powerful that propaganda can be.

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