 The Chauci entered the historical record in descriptions of them by classical Roman sources late in the 1st century BC in the context of Roman military campaigns and sea raiding.For the next 200 years the Chauci provided Roman auxiliaries through treaty obligations, but they also appear in their own right in concert with other Germanic tribes, opposing the Romans.Accounts of wars therefore mention the Chauci on both sides of the conflict, though the actions of troops under treaty obligation were separate from the policies of the tribe.