The Battle of the Teutoburg Forest took place in the Teutoburg Forest in 9 CE, when an alliance of Germanic tribes ambushed and decisively destroyed three Roman legions and their auxiliaries, led by Publius Quinctilius Varus. The anti-Roman alliance was led by Arminius, who had acquired Roman citizenship and received a Roman military education, thus enabling him to personally deceive the Roman commander and foresee the Roman army's tactical responses.