The Saxon Wars were the campaigns and insurrections of the thirty-three years from 772, when Charlemagne first entered Saxony with the intent to conquer, to 804, when the last rebellion of tribesmen was defeated. In all, 18 campaigns were fought, primarily in what is now northern Germany. They resulted in the incorporation of Saxony into the Frankish realm and their forcible conversion from Germanic paganism to Christianity.The Saxons were divided into four subgroups in four regions. Nearest to the ancient Frankish kingdom of Austrasia was Westphalia, and farthest was Eastphalia. In between the two kingdoms was that of Engria (or Engern), and north of the three, at the base of the Jutland peninsula, was Nordalbingia. Despite repeated setbacks, the Saxons resisted steadfastly, returning to raid Charlemagne's domains as soon as he turned his attention elsewhere. Their main leader, Widukind, was a resilient and resourceful opponent, but eventually was defeated and baptized (in 785). Medieval sources describe how an Irminsul, a sacred, pillar-like object attested as playing an important role in the Germanic paganism of the Saxons was destroyed by Charlemagne during the Saxon Wars.