What were the difficulties of the war with the nomads of the Huns?

In the 5th century, all of Europe already knew about the warlike tribes of the Huns who came from the depths of Asia. Their countless hordes have inspired fear in kings and kings. True, the rulers were frightened not only by their number and belligerence, but also by the tactics of fighting. The fact is that the main army of the Huns was cavalry, which was very maneuverable and fast. When the cavalry detachments of the Huns met with the enemy, they did not engage in open battle, but preferred to wear him out. Horse archers of the Huns approached at close range, fired from bows, and when the enemy approached, they immediately retreated.