Darfur crisis draws Chad and Sudan toward deeper conflict

This borderline, drawn by Europeans in the 19th century, has so little relevance that the fighters camped out here, some of them just boys, cannot say for sure whether they are in Sudan or Chad. And yet they sit on a deadly tinderbox, foot soldiers in a proxy war involving two of Africa's most divided and unstable nations. Caught between them are more than two million of the world's most vulnerable people.