For the first time in Russian historiography, the book examines the full history of all Roman-German wars on the Rhine and Upper Danube borders from the 2nd century BC to the 2nd century AD. The participation of the Rhine Army of Rome in civil wars and coups is described, the stages and process of creating the Rhine army of the Roman Empire and the grouping of troops in the province of Recia are disclosed, highlights the long and gradual process of creating the Rhine-Rhaetian limes as a system of border fortifications, on which Roman military groups defending Gaul and the Alpine regions were based. The motivations and causal relationships of the events that took place on the Rhine-Danube border of the Empire and in the border provinces are explained. The description of the events of military-political history is based on literary historical sources and on the most accurate analysis of the composition, deployment and movements of the empire's troops on the Rhine-Danube limes, based on the latest data of archeology, epigraphy and papyrology. Prosopography data are also used, which are important for assessing the principles of the personnel policy of the Empire.