Quote Originally Posted by Odin
Curious is there is some condition or trigger to getting a castle battle? I have been attacked many times in my provinces but dont seem to get them.
The horde seems prone to it - build up Khazar before they arrive and I'll bet you can get them to assault you there. I've been assaulted a couple of times in other games recently; once by the French - I think to avoid an excomm, and once by some rebels in a cut-off island province. The first was a glorious but fateful last stand for my men; the second was a glorious narrow victory for a general who went on to earn 8 stars.

It's been said here that you can sometimes provoke an assault by sallying with only the troops in your castle. I mean, don't bring in any outside troops when you sally. The AI may choose to assault you instead. (I can't yet vouch for this method myself.)