In July, Christian teenager Hajja was picking corn in Gwoza, which is in the northeastern region of Nigeria, when the radical Muslim terrorist group Boko Haram, who control that region, kidnapped her. One of the men held a knife to her throat and told her he would kill her if she did not convert to Islam.Reuters interviewed Hajja on November 6, 2013 and reported the terrorist group is now kidnapping Christian women and force them to be slave brides for their fighters. The group's name means "Western education is forbidden" and wants to make Nigeria an Islamic state. They slaughter anyone associated with the West or Christianity. The United States finally designated them a terrorist group on Wednesday. Michael Yohanna, a councilor in Gwoza's local government, said there are many teenagers like Hajja held captive by Boko Haram.The three months Hajja spent as the slave of a 14-strong guerrilla unit, cooking and cleaning for them before she escaped, give a rare glimpse into how the Islamists have changed tack in the face of Nigerian military pressure."I can't sleep when I think of being there," the 19-year-old told Reuters, recounting forced mountain marches, rebel intelligence gathering - and watching her captors slit the throats of prisoners Hajja had helped lure into a trap.A man called Ibrahim Tada Nglayike led the group Hajja was with. On one mission, Hajja was sent to stand in a field near a village to attract the attention of civilians working with the army. When five men approached her, they were ambushed."They took them back to a cave and tied them up. They cut their throats, one at a time," Hajja said. "I thought my heart would burst out of my chest, because I was the bait."Among those who did the killing was the Muslim wife of the leader Nglayike, the only other woman in the band of fighters.