this date in history - Battle of the Teutoburg - defeat for Roman Empire

September 11, 9 AD – The Battle of the Teutoburg Forest ends: The Roman Empire suffers the greatest defeat of its history and the Rhine is established as the border between the Empire and the barbarians for the next four hundred years

"The Battle of the Teutoburg Forest, also called the Varian Disaster (Latin: Clades Variana) by Roman historians, was a major battle fought between an alliance of Germanic peoples and the Roman Empire between 8 and 11 September 9 CE, possibly near modern Kalkriese. Fighting began with an ambush by the Germanic alliance on three Roman legions being led by Publius Quinctilius Varus and their auxiliaries; the alliance was led by Arminius, a Germanic chieftain and officer of Varus's auxilia. Arminius had received Roman citizenship and a Roman military education, thus allowing him to deceive the Romans methodically and anticipate their tactical responses." -Wikipedia

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