 In the battle of Bornhöved in 798, the Obotrite allies of Charlemagne under Thrasco defeated the Nordalbingian Saxons, killing 2,800–4,000 of them.The last insurrection of the Engrian people occurred in 804, more than thirty years after Charlemagne's first campaign against them.This time, the most unruly tribe of them all, the Nordalbingians, found themselves effectively disempowered to rebel.