The Saxons, on the other hand, though if they were beaten in battle they might yield for a time and might promise to pay tribute to the Franks and build churches, remained heathens at heart. When an opportunity occurred, and they learned that the greater part of the Frankish army was in Italy or on the Spanish border, they would sally forth across their boundaries and drive out or kill the missionaries. Charlemagne knew that he could have no peace within his Empire until he had subdued the Saxons; but the task he had set himself was harder than he had imagined, and it was thirty-eight years before he could claim that he had succeeded.
‘The final conquest of the Saxons’, says Eginhard, a scholar who lived at Charlemagne’s court and wrote his life, ‘would have been accomplished sooner but for their treachery. It is hard to tell how often they broke faith, surrendering to the King and accepting his terms, and then breaking out into wild rebellion once more.’ Eginhard continues that Charlemagne’s method was never to allow a revolt to remain unpunished but to set out at once with an army and exact vengeance. On one of these campaigns he succeeded in reaching the forest where the sacred trunk _Irminsul_ was kept and set fire to it and destroyed it; but the Saxons, though disheartened for the moment, soon rallied under the banner of a famous chief called Witikind. We know little of the latter except his undaunted courage that made him refuse for many years to submit to a foe so much stronger that he must obviously gain the final victory.
Charlemagne, exasperated by repeated opposition, used every means to forward his aim. Sometimes he would bribe separate chieftains to betray their side; but often he would employ methods of deliberate cruelty in order to strike terror into his foes. Four thousand five hundred Saxons who had started a rebellion were once cut off and captured by the Franks. They pleaded that Witikind, who had escaped into Denmark, had prompted them to act against their better judgement. ‘If Witikind is not here you must pay the penalty in his stead,’ returned the King relentlessly, and the whole number were put to the sword.
At different times he transplanted hundreds of Saxon households into the heart of France, and in the place of ‘this great multitude’, as the chronicle describes them, he established Frankish garrisons. He also sent missionaries to build churches in the conquered territories and compelled the inhabitants to become Christians.