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There were twelve gates, without any detached works for defence.

In some distance detached works were added.

On 29 March 1855 at Sebastopol, the Crimea, Major Elton, with a small number of men, drove off a party of Russians who were destroying one of the new detached works, taking one prisoner himself.

For the first time the bastion system was given up and replaced by a polygonal system with detached works, which is called Neupreußische Manier (New Prussian Fortress System) or Neudeutsche Manier (New German Fortress System).