ARBIL - In the summer of 2014, IS invaded the Sinjar region in northern Iraq. Hundreds of thousands of residents fled to Iraqi Kurdistan, or to Mount Sinjar, not knowing that help would come days later. Without food or water many died of exhaustion. But IS had come not only to expand the Caliphate, but also to eradicate the Yazidi, a community with its own religion and an ancient culture. Fate awaited residents who were locked down by IS. The men were killed; women and girls sold as slaves and boys were put in IS training camps.