coinage.

Viking raids increased in the early 840s on both sides of the English Channel, and in 843 Æthelwulf was defeated at Carhampton. In 850, Æthelstan defeated a Danish fleet off Sandwich in the first recorded naval battle in English history. In 851, Æthelwulf and his second son, Æthelbald, defeated the Vikings at the Battle of Aclea and, according to the Anglo-Saxon Chronicle, "there made the greatest