Gen. Romeo Dallaire was commander of the U.N. peacekeeping forces in Rwanda 10 years ago during one of the worst massacres in modern history. Some 800,000 Rwandans were killed in 100 days. Most of them were Tutsi and moderate Hutu civilians. During that time Dallaire and his troops were denied authority to intervene. The experience changed him, tormented him, and filled him with guilt. He suffered from post traumatic stress syndrome, was suicidal and depressed. He's written a new account, Shake Hands with the Devil: The Failure of Humanity in Rwanda.