The Devil Came on Horseback is an intense, vivid autobiographical report from the heart of violent Darfur and a call to action by a former American marine who became a military observer for the African Union. The first extensive on-the-ground account of the genocide in Sudan, it leads us through the tragic impact of an Arab government bent on destroying its black African citizens and the frustrating complexity of international inaction. At the same time, it is a powerful memoir of one soldier's awakening to conscience and his awkward, heroic transformation from marine to humanitarian. While bearing witness to unmentionable atrocities, this compelling story offers evidence that the actions of just one committed person have the power to transform the world.