How is the expansion of the Carolingian Empire under Charlemagne best described?

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Quizplus · Accepted Answer

The expansion of the Carolingian Empire under Charlemagne was most successful against the German tribes to the east, including the Saxons, Bavarians, and Avars. While Charlemagne did have large and well-trained armies, they were not the largest in history up to that time, and the destruction of the Saxons was not quick or easy, taking over 30 years of intermittent warfare.

How Is the Expansion of the Carolingian Empire Under Charlemagne