the city quickly became the administrative center of all of sweden's german possessions when the royal swedish tribunal was set up in the fürstenhof. this necessitated a buildup of wismar's fortifications, an operation that field marshal erik dahlbergh was appointed to lead. the result was completely self-contained fortifications with bulwarks as an effective all-round defence system – a system meeting the most modern requirements was thus refined to great efficiency. remains of these fortifications have been preserved, among other places, in the ‘lindengarten' to the east of the wall of the old city.