A few more remarks:
1. "Fabled Dragons cast a different spell after a waiting period" (sometimes quite useful).
2. "Force Field is removed by an expert dispel."
3. "Ballistics. If there is a skill, you can control a large wagon. Which is not always good. If you take a Castle companion, and press autobattle while the wagon is moving (and immediately right-click to prevent the troops from continuing to move), the wagon will immediately break through the gates (100%)."