Here in what has become the world's largest refugee settlement, youth from South Sudan are drawn to soccer, a rare source of entertainment in an otherwise dreary existence. In a bid to keep young people busy, the International Rescue Committee and other aid groups are hosting inter-village competitions meant to forge unity among the refugees, most of whom recently fled to Uganda to escape civil war. Many here have lost close relatives since the start in December 2013 of South Sudan's conflict, which has often been waged along ethnic lines and in which tens of thousands of people have been killed.