After the Thirty Years' War, the city wall was strengthened. From 1658 to 1683, a citywide fortress was constructed to plans by the Linz master builder, . The new fortress contained 13 bastions connected by ramparts and was preceded by a moat measuring up to wide. Within the new fortress, many of the historic city wall gates were closed. For example, the southeastern Gate was closed but the Georgian Gate remained open, making the Georgian Gate an even more important entrance to the city.
After the Thirty Years' War, the city wall was strengthened. From 1658 to 1683, a citywide fortress was constructed to plans by the Linz master builder, . The new fortress contained 13 bastions connected by ramparts and was preceded by a moat measuring up to wide. Within the new fortress many of the historic city wall gates were closed. For example, the southeastern Gate was closed but the Georgian Gate remained open, making the Georgian Gate an even more important entrance to the city.