Invader has 12 strength at a wall.
Defender has 5 strength at the wall (2 soldiers, 1 marksmen, 2 walls), but also has a marksmen in a tower (with cannon).
- Does the marksmen in the tower add to the strength (+1)?
Not unless they have bay windows.
- Can the marksmen in the tower be used to absorb casualties?
- Can the marksmen in the tower be killed?