Also by that time, the medieval walls were no longer secure against a serious threat from an army, as they were not designed to be strong enough to resist cannon fire. They were sometimes rebuilt, as at Berwick on Tweed, or retained for use against thieves and other threats of a lower order. Very elaborate and complex schemes for town defences were developed in the Netherlands and France, but these belong mainly to the post-medieval periods. By 1600, the medieval wall is likely to have been seen more as a platform for displaying hangings and the pomery as a gathering ground for spectators, or as a source of building stone and a site for its use, respectively. However, a few, such as those of Carcassonne and Dubrovnik, survived fairly well and have been restored to a nearly complete state.