In his new position of Duke of Saxony he held the Land of Hadeln around Otterndorf, south of the river Elbe right opposite of Ditmarsh on the north bank.
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Siegfried continued and promoted the interior colonisation by settling wasteland and draining and diking marshes, as in Oberneuland (1181; a part of today's Bremen), Stuhr (1183), Osten and the marshes along the river Oste.
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He participated in the foundations of the monastery in Osterholz (1182) and Heiligenrode (1180/1183; a part of today's Stuhr).
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Frederick refused to receive the rank as Emperor like a papal fief, which is why he conflicted with Pope Alexander III.
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In the course of the battle an East Frisian peasant army under Focko Ukena and Sibet of Rüstringen defeated the Oldenburg troops called by Chieftain Ocko II tom Brok to assist him, the Archbishop of Bremen and the counts of Hoya, Diepholz and Tecklenburg, who had besieged Detern.
Their united forces formed a very respectable array, and they took and destroyed a number of towns, and had recovered a great part of the County of Holstein, when they were opposed by Schauenburg Count Adolf IV of Holstein, who had been joined by his liege lord Albert I, Duke of Saxony and Prince-Archbishop Gerhard II of Bremen.
At some point relics of St Willehad, the Archbishop of Bremen in the 780's were brought to Viborg and placed in St Kjeld's chapel.