Orc tactics against Dwarves.

Why? Please provide more details. It's not a given that you'll have to fight inside a castle! A tent with skilled machine operators and first aid would be very helpful, but a ballista without fire arrows seems like complete nonsense! And another thing really annoys me! The bears roar almost after every attack, which is a complete disadvantage, and they also constantly take the "Soldier's Luck" skill, which greatly increases the chance of roaring. This roar not only drives away my warriors but also lowers their initiative. How can I deal with this?