The southern wall, the central part (up to a maximum height of 13 m) has been best preserved from the time of its foundation to the present day. It is clearly visible the technology of castle construction in the 19th century on the wall.
The outer surface of the wall is made of large, partially hewn boulders. The stones are well matched end-to-end. The gaps between them are filled with stone fragments on lime mortar. Brick was used only for basic structural elements and architectural details. The brick belt on the outer surface of the wall is made in the technique of Baltic or Wends brickwork (alternating two long sides of the brick (brick stretchers) and short (brick header).
In the southern wall, at a distance of 22 m from the south-western tower, there is a small semicircular opening at a height of 4 m from the original courtyard level. It was obviously considered a backup (in case of reconnaissance or escape), and it was possible to get there only with the help of a long ladder.
The southern wall is also interesting because it remains to, though deformed, the old loopholes, which were intended for shooting with bows, crossbows, and later with light firearms.
At the same height, they had different widths and spaced 3.3 m apart. Their three types alternated on the wall.