 In 433 with the rise of Attila and Bleda to unify the Huns, the payment was doubled to 700 pounds.When Roman Africa fell to the Vandals in 439, both Eastern and Western Emperors sent forces to Sicily, intending to launch an attack on the Vandals at Carthage, but this project failed.Seeing the Imperial borders without significant forces, the Huns and Sassanid Persia both attacked and the expeditionary force had to be recalled.