The crisis in Darfur, Sudan, which has been trickling into Chad for the better part of three years, is now bleeding freely across the border. A counterinsurgency carried out by the Sudanese government and its militias against rebel groups in Darfur, characterized by war crimes and “ethnic cleansing,” has forcibly displaced almost two million civilians in Darfur and another 220,000 people who have fled across the border into Chad. The same ethnic “Janjaweed” militias that have committed systematic abuses in Darfur have staged cross-border raids into Chad, attacking Darfurian refugees and Chadian villagers alike, seizing their livestock and killing those who resist. The government of Sudan is actively exporting the Darfur crisis to its neighbor by providing material support to Janjaweed militias and by failing to disarm or control them, by backing Chadian rebel groups that it allows to operate from bases in Darfur, and by deploying its own armed forces across the border into Chad.