On a related note, I was wondering if there was a way to minimize the destruction of buildings/improvements when I choose to retreat to a castle? I appreciate that there will (and should be) some damage when an enemy army rolls through my proviences, but at times the damage caused seems to exceed the abilities of even the most committed troops.

Any suggestions or comment would be appreciated as I often find myself accepting battle on less than favorable terms because I do not want to lose ALL or most of my buildings/improvements. Thanks.