Give advice to Alfred (ruler of Wessex): how to defeat the Normans and what to do after victory so that you can not be afraid of them in the future?
Guerrilla warfare of peasant detachments plus attacks by squads in favorable conditions; vigilantes must fight in the correct formation, like the Normans. The defeated Normans must be baptized.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.