ERRATAOops, sorryhttp://www.nytimes.com/2008/05/04/world/middleeast/04iraq.htmlThe ugly daily fight for ground in the poor Shiite neighborhood of Sadr City unfolded Saturday at a small mosque next door to a hospital, damaging the hospital and many of its ambulances, and near a group of children who were injured by the violence as they gathered tin cans to sell for salvage.The first hit, close to