sentences:  Moreover, the treaty confirmed the peace established by both signatories in 810.Since the days of King Offa the Eider river had been the border between the settlement area of the Angles and Saxons.After Charlemagne had subjected the Duchy of Saxony to his rule, Hemming's predecessor and uncle Gudfred took the chance, crossed the Eider and campaigned in the southern lands, which Charles had left to the allied Obotrites.