He leads a Frankish army into Saxony to retake the castrum of Syburg ( near Dortmund ) , then rebuilds and garrisons fortified Eresburg .
Saxon Wars : King Charlemagne holds a major assembly at Quierzy ( Northern France ) .
Charlemagne leads a Frankish army into Saxony to retake the castrum of Syburg ( near Dortmund ) , then rebuilds and garrisons fortified Eresburg .
Saxon Wars : King Charlemagne holds a major assembly at Quierzy ( Northern France ) .