The leaders of Darfur's four leading rebel movements have only a month left to bring their fighters back to Sudan. Under the terms of the peace agreement they signed with the Sudanese transitional government in early October, the militias must start to regroup under the flag of a unified Sudanese army before the end of the year. The problem is that, since they were driven out of Sudan in 2015, most of the militia fighters have found a new home in Libya, where they are fighting in the ranks of Field