They gave the romans a nice touch up in the year 9bc, it would...

They gave the romans a nice touch up in the year 9bc, it would have been one of romes few defeats.
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The Battle of the Teutoburg Forest (German: Schlacht im Teutoburger Wald, Hermannsschlacht or Varusschlacht), described as clades Variana (the Varian disaster) by Roman historians, took place in 9 CE, when an alliance of Germanic tribes led by Arminius of the Cherusci ambushed and decisively destroyed three Roman legions and their auxiliaries, led by Publius Quinctilius Varus.

Despite several successful campaigns and raids by the Roman army in the years after the battle, they never again attempted to conquer Germania territory east of the Rhine River.
The Roman force was led by Publius Quinctilius Varus, a noble from a patrician family[4] who was related to the Imperial family,[5] and was an experienced administrative official. He was assigned to consolidate the new province of Germania in the autumn of 6 CE.[4] Earlier that year, before Varus was commander on the Rhine, Legatus Gaius Sentius Saturninus[6][7] and Consul Legatus Marcus Aemilius Lepidus led a massive army of 65,000 heavy infantry legionaries, 10,000–20,000 cavalrymen, archers, 10,000–20,000 civilians (13 legions and their entourage, totalling around 100,000 men) in an offensive operation against Maroboduus,[4][8] the king of the Marcomanni, who were a tribe of the Suebi. Following their defeat at the hands of Drusus I in 9 BCE, they had fled into the territory of the Boii, from which they formed an alliance with the Hermunduri, Quadi, Semnones, Lugians, Zumi, Butones, Mugilones, Sibini and Langobards.[9]

In 4 CE, Tiberius entered Germania and subjugated the Cananefates in Germania Inferior, the Chatti near the upper Weser River, and the Bructeri south of the Teutoburg Forest, before leading his army across the Weser. However, in 6 CE a rebellion broke out in the province of Illyricum. Led by Bato the Daesitiate,[10] Bato the Breucian,[11] Pinnes of Pannonia,[12] and elements of the Marcomanni, it was known as the Bellum Batonianum, and it lasted nearly 4 years. Tiberius was forced to stop his campaign against Maroboduus and recognise him as king[13] so that he could then send his eight legions (VIII Augustan, XV Apollonian, XX Victorious Valerian, XXI Predator, XIII Twin, XIV Twin, XVI Gallic and an unknown unit[14]) to crush the rebellion in the Balkans.

All told, nearly half of all Roman legions in existence were sent to the Balkans to end the revolt, which was itself triggered by constant neglect, endemic food shortages, high taxes, and harsh behavior on the part of the Roman tax collectors. This campaign, led by Tiberius and Quaestor Legatus Germanicus under Emperor Augustus, was one of the most difficult, and most crucial, in the history of the Roman Empire. Due to this massive redeployment of available legions, when Varus was named Legatus Augusti pro praetore in Germania, only three legions were available to him.
http://en.wikipedia.org/wiki/Battle_of_the_Teutoburg_Forest