I have personally thought the same thing. It does seem too easy to take castles from the enemy and I would like it to be near impossible to take a citadel without a lot of gunpowder. Historically, the Knights Hospitaller held out in Krak Des Chevaliers for like 10 years with it being seiged. No one ever breached the castle as far as I know. Now that's an example of what it should be like to try and take a citadel.
http://en.wikipedia.org/wiki/Krak_Des_Chevaliers
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