American soldiers retreated warily from the Imam Ali mosque in Najaf yesterday after a furious crowd gathered around them to stop foreign soldiers from approaching one of the holiest shrines of Shia Islam. "Everybody smile!" shouted the platoon commander as he told his baffled men to kneel down and point their weapons at the ground, in a surreal act of submission.The mightiest army in the world is learning the hard way the awkward art of trying to "win the hearts and minds" of suspicious civilians.In other cities civilians have largely been bystanders in the military drama, neither rising up to...