This special piece allows you to make a 4-point fortress. See image for sample configuration.
Vauban Fortress Walls. While these were designed as 6mm (1/285th scale) pieces, they are suitable for gaming in scales from 3mm to 10mm. Of course in 3mm (1/600th scale) these are very large, tall structures, in 6mm (1/285th scale) they are medium size structures, and in 10mm they are a bit smaller.
Walls are .750" (19mm) tall. Walkway width on all pieces is .420" (10.67mm) wide.
Here is a list of wall heights in the various scales:
3mm (1/600th) = 37.5'
6mm (1/285th) = 18'
10mm (1/160th) = 10'
All pieces are sold separately allowing you to make fortresses of various sizes. For example using 1" and 2" straight sections you can make a 6 point fortress in any of the following sizes 6"x6", 6"x8", or 8"x8". You can make larger fortresses by adding additional straight pieces between the corners.