Force ennemies to attack in sieges: how?

[Yann le Honfleurais]

Hello there
I guess it's something to do with Text Editing, that's why I posted it here:
How can I make the ennemies more aggressive and make them attack me during castle sieges?
In more than 50% of the time, when an ennemy attacks once of my castles, it stay's there, doing nothing for 5-10 turns, even if it has siege towers ready.
How can I make it attack more frequently?
Thanks a lot for help

[Gigantus]

It's an AI thing - couldn't be more esoteric than that. Xeryx has got an AI workshop, maybe he can help.

[Yann le Honfleurais]

Cheers, mate!