The Bosnian Serbs hope to gain mileage at the peace talks after handing over 300 male Muslim civilians on Monday in exchange for 150 Serbian prisoners of war, but Marguerite Michaels notes that thousands of men are still missing. TIME's Edward Barnes reports that the war crimes trial in The Hague continues to be a stumbling block: "Senator Patrick Leahy promises to go ballistic on the Senate floor if war criminals are offered immunity for some of the most heinous crimes committed in our lifetime." But the trial may not even get as far as the immunity question. "The only witnesses to the massacres in Srebenica are now living in Tuzla," says Barnes. "And there's no witness protection program.