 Therefore, in 442, Aetius and Valentinian were forced to acknowledge the Vandal conquests of Proconsular Africa, Byzacena, and western Numidia, in exchange for which Rome was returned the now devastated provinces of Tripolitana, Mauretania Sitifensis, Mauretania Caesariensis, and part of Numidia.Regardless, however, Gaiseric had soon retaken Mauretania Sitifensis and Mauretania Caesariensis, as well as taking Sardinia and Corsica, and conducting devastating raids on Sicily.Therefore, Aetius was determined that, if they could not prevent Gaiseric wreaking havoc by military means, then perhaps linking him to the imperial dynasty would be the next best thing.