The Piave began slowly to modify the environmental balance of Jesolo and of other Islands, and with its frequent floods began a progressive silting up impossible to stop with the means of the time.The water expansion separating the islands from the mainland grew always smaller and created huge problems to the port activities of Jesolo, and easied the arrival of foreign people to the town. Jesolo was invaded once again by Hungarian nomads who needed preys not lands: they distroyed the Marca Friulana and reached Verona sacking with a incredible fury the whole land defeating easily the stronger defences of towns and castles.They went up to Pavia, capital of the Reign of Italy, from where Berengario I left to fight against them and managed to send them back to the Venetian lands. Tradition reports that on June, 29 900 they were defeated in the attempt of reaching Rialto. They had built rafts, leather bags, skins and other boats. But they managed to invade other towns: Eraclia, Equilio, Chioggia and Capodargine (Cronaca of John the Deacon).
