Louis the pious was rebelled against by his own sons. The rebellion failed but the Frankish kingdoms internal struggle attracted the vikings. Frisia was looted and the rich trade centre Dorestad, which was placed 80 kilometres from the sea, at Kromme Rijn River was plundered several times 834-837.
The archbishop Ebo had chosen to support the rebellion, he managed to escape to Denmark,but he was caught and then placed in a monastery.
Anglo-Saxon Chronicle reported that "heathen men" raided Charmouth, Dorset and 35 Danish ships defeated king Egbert of Wessex at Carhampton.