When Erik Dahlberg took responsibility for Sweden's fortifications in 1676 he implemented Karl XI's wishes for modern bastions of high wall construction. The ramparts were lined with walls of blasted rock and the fortified town of Gothenburg developed with 13 polygonal bastions and accompanying moat, ravelins and 3 city gates (Kungsporten; Nya porten, later re-named Drottningporten; and Karlsporten/Hållgårdsporten).