Some historical information:
In the Germanic society, the warrior constituted the base of the social structure and war represented the sole and true masculine occupation. The type of war that maintained this structure was however quite different from that fought in the Greco-Roman world and constituted a ritual one with the main objective been not the destruction of the enemy but rather the accumulation of richness, prestige or ending a vendetta. The weapons and tactics were very simple. With the arrival of the Romans, everything changed. The weapons and equipment became more sophisticated, the clashes more bloody and the Germanics that lived long found themselves fighting for their survival. Some Germanics lend their service to the Romans, some becoming the personal bodyguards of the Emperor (the first to use them was Julius Caesar) and they accumulated richness beyond every imagination. Those who remained in their lands, formed alliances to stop the Roman advancement which lead to clashes like the one at Teutenburg. Some used tactics learned from their service in the Roman army (like Arminus or Maroboduo). The auxiliary troops or "troops of support", in Latin auxilia, were a part of the Roman army recruited from the submissive populations of peregrine, who as yet did not possess Roman citizenship. Gaius Julius Caesar started using cavalry contingents from the allied populations in the course of the conquest of Gaul. The recruitment of auxiliaries was mainly from Gaul and Germania, from the west provinces like the Gaul, Hispania, the Batavia, Thrace, and others from areas beyond such as Germania Major. Augustus also reorganized the system of enlistment offering them permanent recruitment and not just recruitment for the occasional military campaigns, uniform equipment and a quarterly pay equating to about one third of how much a legionary was paid. Augustus established, those who remained away from their region for a period of 25 years and at the moment of dismissal obtained a final reward (either in money or a piece of land to cultivate, in the new provinces to colonize like veterans), Roman citizenship, the legalisation of any marriage (ius connubii) and the possibility for their sons to be recruited to the service of the Roman legions.