She was trafficked into Raqa as a sex slave by the Islamic State group but managed to escape. Now Yazidi fighter Heza is back to avenge the horrors she and thousands of others suffered. Her hair tucked under a tightly wrapped forest green shawl embroidered with flowers, Heza says battling IS in its Syrian bastion has helped relieve some of her trauma."When I started fighting, I lifted some of the worries from my heart," she says, surrounded by fellow Yazidi militia women in Raqa's eastern Al-Meshleb district."But it will be full of revenge until all the women are freed." She...