With mats and mattresses on their heads, pots and plastic bags in their hands, the people just kept walking. Some also drove cattle through the red dust kicked up by the white United Nations armoured vehicle that led the convoy through Bentiu town as the sun set. They were all heading the same way - south - away from the advancing government troops intent on retaking the city from rebel forces. When the split between President Salva Kiir and former Vice-President Riek Machar turned to violence, the army#039;s 4th Division stationed in Bentiu switched sides and backed the rebels. For two weeks the troops from the Nuer tribe have controlled the capital of oil-producing Unity State. But change...