The Danes attacked them both, and defeated them with great slaughter.

Northumbria passed at once into the power of the heathen.

Their chiefs, Ingvar and Ubba, erected Deira into a new Danish kingdom, leaving Bernicia to an English puppet; and Northumbria ceases to exist for the present as a factor in Anglo-Saxon history.

We must hand it over for sixty years to the Scandinavian division of this series.
In 868, Ingvar and Ubba advanced again into Mercia and beset Nottingham.
Then the under-king Burhred called in the aid of his over-lord, AEthelred of Wessex, who came to his assistance with a levy.

"But there was no hard fight there, and the Mercians made peace with the host." In 870, the heathen overran East Anglia, and destroyed the great monastery of Peterborough, probably the richest religious house in all England.
Eadmund, the under-king, came against them with the levy, but they slew him; and the people held him for a martyr, whose shrine at Bury St.
Edmunds grew in after days into the holiest spot in East Anglia.