Brothers in Hope by Mary Williams, illustrated by R. Gregory Christie

From the School Library Journal:
During the mid-1980s, Sudan was embroiled in civil war in which over two million lives were lost. Williams bases this fictional picture book on the harrowing, real-life experiences of a band of approximately 30,000 southern Sudanese boys, between the ages of 8 and 15, who walked nearly 1000 miles searching for a safe refuge.