Well I could tell from looking at the castle at the start it wasnt a very strong castle. I pretty much just rushed it with Archers, Crossbowman and Pikeman. Took the Castle on the first attempt without much fuss. The biggest flaw in the design was your Towers did not support each other or the Keep. They were seperated too much. I would place my towers all supporting the Keep and each other as much as possible. Also no siege equiptment on your large towers for long range heavy hitting. Not to be all negative but the castle wasnt too tough.