Following the attacks of Drusus I in 11–9 BCE, Arminius, along with his brother Flavus, was sent to Rome as tribute by their father, Segimerus the Conqueror, chieftain of the noblest house in the tribe of the Cherusci.
Arminius then spent his youth in Rome as a hostage, where he had received a military education, and even been given the rank of Equestrian.
During Arminius' absence, Segimerus was declared a coward by the other Germanic chieftains, because he had submitted to Roman rule, a crime punishable by death under Germanic law.
Between 11 BCE and 4 CE, the hostility and suspicion between the Germanic tribes deepened.
Trade and political accords between the warlords deteriorated.

In 4 CE the Roman general (and later emperor) 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.
After these conquests he led his army across the Weser.

In early 6 CE Legatus Gaius Sentius Saturninus 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, the king of the Marcomanni, who were a tribe of the Suebi.
Later in 6 CE, leadership of the Roman force was turned over to Publius Quinctilius Varus, a nobleman and experienced administrative official from a patrician family who was related to the Imperial family.
 He was assigned to consolidate the new province of Germania in the autumn of that year.

Tiberius was then forced to turn his attention to the Bellum Batonianum, also known as the Great Illyrian Revolt, which broke out in the province of Illyricum.
Led by Bato the Daesitiate, Bato the Breucian, Pinnes of Pannonia, and elements of the Marcomanni, it lasted nearly four years.
Tiberius was forced to stop his campaign against Maroboduus and recognise him as king 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) to crush the rebellion in the Balkans.

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 behaviour 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.

Varus' name and deeds were well known beyond the empire because of his ruthlessness and crucifixion of insurgents.
 While he was feared by the people, he was highly respected by the Roman senate.
On the Rhine, he was in command of the XVII, XVIII, and XIX legions.
 These had previously been led by General Gaius Sentius Saturninus, who had been sent back to Rome after being awarded an ornamenta triumphalia.
The other two legions in the winter-quarters of the army at castrum Moguntiacum were led by Varus' nephew, Lucius Nonius Asprenas and perhaps Lucius Arruntius.

After his return from Rome, Arminius became a trusted advisor to Varus, but in secret he forged an alliance of Germanic tribes that had traditionally been enemies.
 These included the Cherusci, Marsi, Chatti, Bructeri, Chauci, Sicambri, and remaining elements of the Suebi, who had been defeated by Caesar in the Battle of Vosges.
These five were some of the fifty Germanic tribes at the time.
Using the collective outrage over Varus' tyrannous insolence and wanton cruelty to the conquered, Arminius was able to unite the disorganized tribes who had submitted in sullen hatred to the Roman dominion, and maintain the alliance until the most opportune moment to strike.

 Between 6 and 9 CE, the Romans were forced to move eight of eleven legions pres
Following the attacks of Drusus I in 11–9 BCE, Arminius, along with his brother Flavus, was sent to Rome as tribute by their father, Segimerus the Conqueror, chieftain of the noblest house in the tribe of the Cherusci. Arminius then spent his youth in Rome as a hostage, where he had received a military education, and even been given the rank of Equestrian. During Arminius' absence, Segimerus was declared a coward by the other Germanic chieftains, because he had submitted to Roman rule, a crime punishable by death under Germanic law. Between 11 BCE and 4 CE, the hostility and suspicion between the Germanic tribes deepened. Trade and political accords between the warlords deteriorated.
In 4 CE the Roman general (and later emperor) 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. After these conquests he led his army across the Weser.
In early 6 CE Legatus Gaius Sentius Saturninus 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, the king of the Marcomanni, who were a tribe of the Suebi. Later in 6 CE, leadership of the Roman force was turned over to Publius Quinctilius Varus, a nobleman and experienced administrative official from a patrician family who was related to the Imperial family.  He was assigned to consolidate the new province of Germania in the autumn of that year.
Tiberius was then forced to turn his attention to the Bellum Batonianum, also known as the Great Illyrian Revolt, which broke out in the province of Illyricum. Led by Bato the Daesitiate, Bato the Breucian, Pinnes of Pannonia, and elements of the Marcomanni, it lasted nearly four years. Tiberius was forced to stop his campaign against Maroboduus and recognise him as king 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) to crush the rebellion in the Balkans.
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 behaviour 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.
Varus' name and deeds were well known beyond the empire because of his ruthlessness and crucifixion of insurgents.  While he was feared by the people, he was highly respected by the Roman senate. On the Rhine, he was in command of the XVII, XVIII, and XIX legions.  These had previously been led by General Gaius Sentius Saturninus, who had been sent back to Rome after being awarded an ornamenta triumphalia. The other two legions in the winter-quarters of the army at castrum Moguntiacum were led by Varus' nephew, Lucius Nonius Asprenas and perhaps Lucius Arruntius.
After his return from Rome, Arminius became a trusted advisor to Varus, but in secret he forged an alliance of Germanic tribes that had traditionally been enemies.  These included the Cherusci, Marsi, Chatti, Bructeri, Chauci, Sicambri, and remaining elements of the Suebi, who had been defeated by Caesar in the Battle of Vosges. These five were some of the fifty Germanic tribes at the time. Using the collective outrage over Varus' tyrannous insolence and wanton cruelty to the conquered, Arminius was able to unite the disorganized tribes who had submitted in sullen hatred to the Roman dominion, and maintain the alliance until the most opportune moment to strike.
 Between 6 and 9 CE, the Romans were forced to move eight of eleven legions pres
Battle of the Teutoburg Forest