American-led forces have captured more than half a dozen Iraqi generals and are questioning them about chemical weapons and tactical battle information, defense officials said Tuesday. Although some are cooperating to some extent, none has given information that has led invading forces to hidden chemical weapons that the Bush administration says Iraq has, the officials said. Meanwhile, a separate long-term campaign to win high-level military defections has had no visible success. The generals surrendered or were captured by U.S. or British forces, two Pentagon officials said on condition of anonymity. They were taken from locations around the country and hold...