A former commander of the U.N. peacekeeping force in Bosnia testified Tuesday that Radovan Karadzic directed Serb troops to terrorize civilians with sniping campaigns and reduce Muslim enclaves to near starvation throughout the country's devastating war.

British Gen. Michael Rose's testimony at Karadzic's genocide trial is expected to be key to proving the former Bosnian Serb leader had complete control over troops responsible for the 1992-95 conflict's most bloody atrocities.

Rose and Karadzic, who held frequent meetings in Bosnia during the war, barely glanced at one another throughout Tuesday's testimony at the Yugoslav war crimes tribunal. Karadzic gazed intently at a computer screen while Rose was led into the courtroom, while Rose looked across at judges....