Recent fighting in South Sudan’s Unity State between government troops and opposition forces has placed civilians at renewed risk and once again threatened the shaky cessation of hostilities agreement signed in January. Earlier this month members of a United Nations Security Council delegation to South Sudan reportedly expressed alarm that the warring parties are still acquiring arms. Here, Amnesty International’s Elizabeth Deng and Geoffrey L. Duke, of the South Sudan Action Network on Small Arms explain why an arms embargo should be a priority.