I was really pleased to be handed the last of my custom-made fortifications from Jim at Dark Architect Terrain this week. The set has more that 40 fully modular lengths, corners, towers, gates and breaches to allow all sorts of combinations.
Here they are thrown down in a pretty random castle set-up; do excuse the board and decking. It was too nice a day not to sit outside! Over on the left you can see an assortment of breaches to be used when walls collapse due to mines, artillery, or direct assault.