Question: During the Hunnic Invastion of 451 Flavius Aetius ended the invastion of a ruler who was the leader of the Huns, Alans and what other groups of people?
Sentence (from "Flavius Aetius"): Notably, he mustered a large Roman and allied ("foederati") army to stop the Huns in the Battle of the Catalaunian Plains, ending the devastating Hunnic invasion of Attila in 451.
Relevant evidence: Yes