==Events and Trends== 450 — The Huns plunder the city of Poetovio in the Pannonia Savia province. 451 — The Huns conquer the city of Sirmium. — The Sassanians defeat the Armenian rebels in The battle of Avarayr. — The Huns and the Ostrogoths facing the Romans and the Visigoths achieve at best a draw in the Battle of Chalons. After the battle, between 10,000 and 20,000 men lie dead on the Catalaunian Fields. 452 453 454 455 — The Vandals sack Rome. 456 457 458… (More on 450s)