- Danes raid the Wendish city of Reric
Drosuk, prince (knjes) of the Obotrites, is captured, and Reric's merchants are forcibly relocated to Hedeby (Haithabu). On the return voyage, the Danes are assaulted by a Frankish army. The Danes manage to break through, but the Danish heir to the throne, Reginald, is slain.
- The construction of Danevirke is begun
After the hazardous campaign to Reric, Danish king Godfred begins construction of a fortification along the line of the Eider river and the Slien fjord. This forms the nucleus of a border fortification that is to last for a thousand years (see 1864).
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