Allowance must be made for Julius Caesar's usual equation of primitive poverty with admirable hardihood and military prowess and his connection of luxurious imports and the proximity of "civilization", meaning his own, with softness and decadence.
Caesar took it as a given that the Celts in the Hercynian Forest were emigrant settlers from Gaul who had "seized" the land, but modern archeology identifies the region as part of the La Tène homeland.