How did the Burgundians serve the Roman Empire as foederati?

The Burgundians served the Roman Empire as foederati, or auxiliaries, within the Roman military. After migrating westward from the Vistula River region to the borders of the empire, they entered into this treaty-based relationship to provide defensive support.1

As foederati, the Burgundians were contracted to assist Rome, a status that historically involved establishing permanent friendly relations and providing military aid. Through this arrangement, the Burgundians were able to establish a powerful kingdom that extended to the west bank of the Rhine River by the early 5th century, eventually centering their authority in Sapaudia (Savoy) near Lake Geneva. This role as allies allowed them to maintain a degree of autonomy while serving the strategic interests of the Roman state.21