26,000 troops and police will try to stop attacks on displaced people . The effort is expected to cost $ 2 billion the first year . Expected to cost more than $ 2 billion in the first year , the combined United Nations-African Union operation aims to quell violence in Darfur , where more than 2.1 million people have been driven into camps and an estimated 200,000 have died over the last four years . 2.1 million people are refugees ; an estimated 200,000 Sudanese dead .
26,000 troops and police will try to stop attacks on displaced people . The effort is expected to cost $ 2 billion the first year . 2.1 million people are refugees ; an estimated 200,000 Sudanese dead .