Which lands between the Elbe and Oder rivers came under Otto I’s control by 960?

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By 960, a series of military campaigns led to the subjection of the Slavic tribes living in the region between the middle Elbe and the middle Oder rivers under the control of Otto I.1

While Saxon margraves like Gero and Hermann Billung had previously been successful in their efforts against the Slavs, these specific territorial gains were consolidated through these later campaigns. To secure their hold on the region, the Saxons built and garrisoned forts between the two rivers, though German agricultural settlement in these areas remained limited during the 10th century.123