Over four days at the beginning of September AD 9, half of Rome's Western army was ambushed in a German forest and annihilated. Three legions, three cavalry units and six auxiliary regiments—some 25,000 men—were wiped out. It dealt a body blow to the empire's imperial pretensions and was Rome's greatest defeat. No other battle stopped the Roman empire dead in its tracks. From the moment of the Teutoburg Forest disaster, the Rhine, rather than the Elbe as the Romans had hoped, became the limit of the civilized world. Rome's expansion in northern Europe was checked and Rome anxiously patrolled the Rhineland borders, awaiting further uprisings from Germania. Although one of the most significant and dramatic battles in European history, this is also one that has been largely overlooked. Drawing on primary sources and a vast wealth of new archeological evidence, Adrian Murdoch brings to life the battle itself, the historical background, and the effects of the Roman defeat as well as exploring the personalities of those who took part.