not sure if this has been mentioned before but dwarves can't climb onto the walls when attacking towns, i had some high clerics of moradin and dwarf paragons in my army and i use them to attack castles but when i went after yalen or jelkalla they blocked the ladder and i was left soloing 400 enemies(either this did not happen for velucca or i missed it because i was with other blazing hand vassals at the time and their troops scaled the walls first)