No less than 470 people were killed in an explosion of violence between Arab and non-Arab tribes last month in Darfur. The bloodletting stoked fears that Darfur, scene of a vicious war in the 2000s, could slide back into conflict and raised questions over the government’s efforts to implement a peace deal and protect civilians. The lethal clashes were reminiscent of the days in 2003 and 2004 when militias known ...