For three years Charlemagne had to redouble his efforts to accomplish in Saxony, at the cost of Frankish as well as Saxon blood, his work of conquest and conversion: "Saxony," he often repeated, "must be christianized or wiped out." At last, in 785, after several victories which seemed decisive, he went and settled down in his strong castle of Ehresburg, "whither he made his wife and children come, being resolved to remain there all the bad season," says Eginhard, and applying himself without cessation to scouring the country of the Saxons and wearing them out by his strong and indomitable determination.

But determination did not blind him to prudence and policy.

"Having learned that Wittikind and Abbio (another great Saxon chieftain) were abiding in the part of Saxony situated on the other side of the Elbe, he sent to them Saxon envoys to prevail upon them to renounce their perfidy, and come, without hesitation, and trust themselves to him.

They, conscious of what they had attempted, dared not at first trust to the king's word; but having obtained from him the promise they desired of impunity, and, besides, the hostages they demanded as guarantee of their safety, and who were brought to them, on the king's behalf, by Amalwin, one of the officers of his court, they came with the said lord and presented themselves before the king in his palace of Attigny [Attigny-sur-Aisne, whither Charlemagne had now returned] and there received baptism." Charlemagne did more than amnesty Wittikind; he named him Duke of Saxony, but without attaching to the title any right of sovereignty.

Wittikind, on his side, did more than come to Attigny and get baptized there; he gave up the struggle, remained faithful to his new engagements, and led, they say, so Christian a life, that some chroniclers have placed him on the list of saints.