This was Posted by Nazareth LionHeart:

https://docs.google.com/file/d/0B9yH9zhSxVF6eFRNam5PcGkxb1k/


(Original Quote by Naz)
Folks, we need to build better castles.
One reason they rolled over people is the castles were weak even by princes.
I've linked below my latest castle design that would require quite a bit of effort to take.
Notice the great towers surrounding the interior.
They can hold 200 Archers which will cost an attacker a lot of troops to take.
Additional archers can be placed on comers to eat up catapults.
Just filling up the build area with walls or smaller towers will not make it harder to break into.

https://docs.google.com/file/d/0B9yH9zhSxVF6eFRNam5PcGkxb1k/