The Battle of the Teutoburg Forest, also called the Varus Disaster or Varian Disaster by Roman historians, was a major battle between Germanic tribes and the Roman Empire that took place somewhere near modern Kalkriese from September 8–11, 9 AD, when an alliance of Germanic peoples ambushed three Roman legions 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.