Marbod is reluctant to ally with the Cherusci, but is convinced firstly by the escape of his Roman advisors, and secondly because, as proof of his loyalty, Hermann put the lives of Marbod's two sons into the hands of Suevenfürsten. The rape of a girl gives Germanic Hermann an occasion to call the people to revolt against the Romans. He shows Thusnelda a letter from Ventidius, in which he promises the Empress Livia a lock of Thusnelda's blond hair. The Romans wander through the Teutoburg Forest and are abandoned by their Germanic allies. Thusnelda gets revenge on Ventidius by luring him into the enclosure of a bear that then kills him. In the battle of the Teutoburg Forest, the Roman legions of Varus are defeated and their commander killed.