Well, first I declare, that you have a lot of talent creating maps; your feeling for a nice, creative designed landscape and fortress as well is remarkable. But there are some things you have to work on or to improve, concerning playability, balance or story for instance:
Try to eliminate "bugs" for example; in this actual case I simply (cheat) pulled down the stoney stairs (now the enemy couldn't enter the castle)and then watched my archers and crossbowmen killing the aproaching enemy. I had nothing to do, my archers did the rest. So I've lost just 3% of my soldiers... You better should update the map by adding a natural access,as soon as the enemy has destroyed the gate houses to take by storm.After that you really will have a "thrilly" challenge because of the big invasions and it will become a great map.
My rating is primarily focused on Creativity and Map Design, please concentrate on this point of view!
Greetings and "happy gaming"
P.S.: I surely will update my total ratings, if you improve(update) this map,too.