Marey hold last fortified town of your kingdom. The invader is powerful you can hope only your intelligence to carry out your men to gain the victory. Be short and precise. A council captain keep your first line longest possible so that your precision balances crush a maximum of enemy craniums. The king by his presence in the large tower will give courage to your men.
This is a good looking map, you have the potential to be a great designer.
The coast around the castle looks great and I like the castle design. The hills are equalised nicely though you should include more terrain detail on these parts e.g. rocks, dirt, shrubs...you know what I mean.
Keep at the designing, make sure to download some good maps to see what great terraining looks like and read tutorials and visit the forum.
P.S My exams are over so I'll treat myself to some Strongholding and I'll play your map.