With an attack on Mamata Banerjee for "Sonar Bangla (golden Bengal) becoming poorer by the day," Amit Shah today launched the BJP's Mission Bengal from the tiny village of Naxalbari, where the violent Naxal uprising had begun in the 1960s. "I want you to shout so loudly that it can be heard in Kolkata," the BJP chief said, declaring that development would defeat violence.