Can you take out the X next to B4. It would seem to make the game play better. Make it a shallow area?
Also what about P4 and P3 as Canon's to fire back
Then W7, 8, 9, 10 as Archers. Making C4, 5, 6, as such would not make much sense as archers cannot fire that long. An attack range of 2 would be plenty for an archer.
So W7 would be able to attack L1, L2, L3, S2, P1
Great ideas Bruce - finding a succinct way to describe range can be tricky but I'm sure it could be done without using much space.