 On August 7, a fleet of Persian rafts ferrying troops across the Bosporus to the European side were surrounded and destroyed by the Byzantine fleet.The Sclaveni then attempted to attack the Sea Walls from across the Golden Horn, while the Avars attacked the land walls.However, the Sclaveni boats were rammed and destroyed by the galleys of Bonus, and the Avar land assaults on August 6 and 7 were repelled.