As dawn broke, the residents of a quiet neighborhood here readied for battle. Some piled rocks to be used as projectiles. Others built barricades. A pair of teenagers made firebombs as the adults looked on. These were not your ordinary urban guerrillas. They included a manicurist, a medical supplies saleswoman, a schoolteacher, a businessman and a hardware store worker. As the National Guard roared around the corner on motorcycles and in an armored riot vehicle, the people in this tightly knit middle-class neighborhood, who on any other Monday morning would have been heading to work or taking their children to school, rushed into the street, hurling rocks and shouting obscenities. The guardsmen responded with tear gas and shotgun fire, leaving a man bleeding in a doorway. […]