Batul Javil's story is familiar, but terrifying all the same. She had taken her children to visit her parents in a neighbouring village in Sudan's southern Blue Nile state beyond which, after an international border was created in July 2011, Khartoum's rule ends and newly independent South Sudan begins. It was a day, she says, like any other. Then without warning, all hell broke loose. "All of a sudden, the war came," Javil says. A plane darkened the sky, dropping bombs indiscriminately on the village and its inhabitants. All they could do was run, she says, try to find cover, simply get away. The family could not go back to their village, could not stay where they were, so they...