1. they were able to form alliances with other barbarian groups to invade the Empire.
2. of their leader, Attila, and the terrible actions he took against those he conquered.
3. they were Asians, not Europeans.
4. they brought strange diseases with them from Asia.
After hours of ferocious fighting that lasted well into the dark of night, tens of thousands of soldiers were dead, and the Roman alliance had forced the Hun army to retreat. It was Attila's first and only military defeat.( 2)