Cherusci in the context of "Chatti"

The Roman campaigns in Germania (12 BC – AD 16) were a series of conflicts between the Germanic tribes and the Roman Empire. Tensions between the Germanic tribes and the Romans began as early as 17/16 BC with the Clades Lolliana, where the 5th Legion under Marcus Lollius was defeated by the tribes Sicambri, Usipetes, and Tencteri. Roman Emperor Augustus responded by rapidly developing military infrastructure across Gaul. His general, Nero Claudius Drusus, began building forts along the Rhine in 13 BC and launched a retaliatory campaign across the Rhine in 12 BC.

Drusus led three more campaigns against the Germanic tribes in the years 11–9 BC. For the campaign of 10 BC, he was celebrated for being the Roman who traveled farthest east in northern Europe. Succeeding generals would continue attacking across the Rhine until AD 16, notably Publius Quinctilius Varus in AD 9. During the return trip from his campaign, Varus' army was ambushed and almost destroyed by a Germanic force led by Arminius at the Battle of the Teutoburg Forest; Arminius was the leader of the Cherusci, had previously fought in the Roman army, and was considered by Rome to be an ally. Roman expansion into Germania Magna stopped as a result, and all campaigns immediately after were in retaliation of the Clades Variana ("Varian Disaster"), the name used by Roman historians to describe the Battle of the Teutoburg Forest, and to prove that Roman military might could still overcome German lands. The last general to lead Roman forces in the region during this time was Germanicus, the adoptive son of Emperor Tiberius, who in AD 16 had launched the final major military expedition by Rome into Germania.

The concept of Germany as a distinct region in Central Europe can be traced to Julius Caesar, who referred to the unconquered area east of the Rhine as Germania, thus distinguishing it from Gaul. The victory of the Germanic tribes in the Battle of the Teutoburg Forest (AD 9) prevented annexation by the Roman Empire, although the Roman provinces of Germania Superior and Germania Inferior were established along the Rhine. Following the Fall of the Western Roman Empire, the Franks conquered the other West Germanic tribes. When the Frankish Empire was divided among Charles the Great's heirs in 843, the eastern part became East Francia, and later Kingdom of Germany. In 962, Otto I became the first Holy Roman Emperor of the Holy Roman Empire, the medieval German state.

During the High Middle Ages, the Hanseatic League, dominated by German port cities, established itself along the Baltic and North Seas. The development of a crusading element within German Christendom led to the Northern Crusades and the establishment of the State of the Teutonic Order along the Southern Baltic coast in what would later become Prussia. In the Investiture Controversy, the German Emperors resisted Catholic Church authority. In the Late Middle Ages, the regional dukes, princes, and bishops gained power at the expense of the emperors. Martin Luther led the Protestant Reformation within the Catholic Church after 1517, as the northern and eastern states became Protestant, while most of the southern and western states remained Catholic. The Thirty Years' War, a civil war from 1618 to 1648 brought tremendous destruction to the Holy Roman Empire. The estates of the empire attained great autonomy in the Peace of Westphalia, the most important being Austria, Prussia, Bavaria and Saxony. With the Napoleonic Wars, feudalism fell away and the Holy Roman Empire was dissolved in 1806. Napoleon established the Confederation of the Rhine as a German puppet state, but after the French defeat, the German Confederation was established under Austrian presidency. The German revolutions of 1848–1849 failed but the Industrial Revolution modernized the German economy, leading to rapid urban growth and the emergence of the socialist movement. Prussia, with its capital Berlin, grew in power. German universities became world-class centers for science and humanities, while music and art flourished. The unification of Germany was achieved under the leadership of the Chancellor Otto von Bismarck with the formation of the German Empire in 1871. The new Reichstag, an elected parliament, had only a limited role in the imperial government. Germany joined the other powers in colonial expansion in Africa and the Pacific.

Nero Claudius Drusus Germanicus (38–9 BC), commonly known in English as Drusus the Elder, was a Roman general and politician. He was a patrician Claudian but his mother was from a plebeian family. He was the son of Livia Drusilla and the stepson of her second husband, the Emperor Augustus. He was also brother of the Emperor Tiberius; the father of the Emperor Claudius and general Germanicus; paternal grandfather of the Emperor Caligula, and maternal great-grandfather of the Emperor Nero.

Drusus launched the first major Roman campaigns across the Rhine and began the conquest of Germania, becoming the first Roman general to reach the Weser and Elbe rivers. In 12 BC, he led a successful campaign into Germania, subjugating the Sicambri. Later that year he led a naval expedition against Germanic tribes along the North Sea coast, conquering the Batavi and the Frisii, and defeating the Chauci near the mouth of the Weser. In 11 BC, he conquered the Usipetes and the Marsi, extending Roman control to the Upper Weser. In 10 BC, he launched a campaign against the Chatti and the resurgent Sicambri, subjugating both. The following year, while serving as consul, he conquered the Mattiaci and defeated the Marcomanni and the Cherusci, the latter near the Elbe. His Germanic campaigns were cut short in the summer of 9 BC by his death after a riding accident.

Arminius (/ɑːrˈmɪniəs/; 18/17 BC–AD 21; Hermann in German) was a chieftain of the Germanic Cherusci tribe who is best known for commanding an alliance of Germanic tribes at the Battle of the Teutoburg Forest in AD 9, in which three Roman legions under the command of general and governor Publius Quinctilius Varus were destroyed. His victory at Teutoburg Forest precipitated the Roman Empire's permanent strategic withdrawal and the deprovincialization of Germania Magna, and modern historians regard it as one of Imperial Rome's greatest defeats. As it prevented the Romanization of Germanic peoples east of the Rhine, it has also been considered one of the most decisive battles in history and a turning point in human history.

Born a prince of the Cherusci tribe, Arminius was part of the Roman-friendly faction of the tribe. He learned Latin and served in the Roman military, which gained him Roman citizenship, and the rank of eques. After serving with distinction in the Great Illyrian Revolt, he was sent to Germania to aid the local governor Publius Quinctilius Varus in completing the Roman conquest of the Germanic tribes. While in this capacity, Arminius secretly plotted a Germanic revolt against Roman rule, which culminated in the ambush and destruction of three Roman legions in the Teutoburg Forest.

Flavus was a member of the royal family of the Germanic Cherusci tribe who served in the Roman military. He is chiefly remembered as the younger brother of Arminius, who led the Germans to victory over the Romans at Teutoburg Forest in AD 9.