(NEW YORK TIMES) — DIBIS, Iraq — The prisoners were taken to a waiting room in groups of four, and were told to stand facing the concrete wall, their noses almost touching it, their hands bound behind their backs.

More than a thousand Islamic State fighters passed through that room this past week after they fled their crumbling Iraqi stronghold of Hawija. Instead of the martyrdom they had boasted was their only acceptable fate, they had voluntarily ended up here in the interrogation center of the Kurdish authorities in northern Iraq.

For an extremist group that has made its reputation on its ferociousness, with fighters who would always choose suicide over surrender, the fall of Hawija has been a notable turning point. The group has suffered a string of humiliating defeats in Iraq and Syria, but the number of its shock troops who turned themselves in to Kurdish officials at the center in Dibis was unusually large, more than 1,000 since last Sunday.

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