Germany’s army stepped in to help as severe rainstorms lashed large parts of the country’s south on Saturday, leading many towns to declare states of emergency as rivers swelled and floods rose, requiring the evacuation of residents and prisoners. As the heavy rainfall continued late into the night, preparations were underway to evacuate 670 people in Upper Bavaria, with boats being deployed in the town of Schrobenhausen, local authorities said, after earlier declaring a state of disaster. At least nine other municipalities also declared a state of emergency as water levels rose during the day…