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In page Battle of the Teutoburg Forest:

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Practically, the Romans were mostly interested in conquering areas that had a high degree of self-sufficiency which could provide a tax base for them to extract from. Most of Germania Magna did not have the higher level of urbanism at this time as in comparison with some Celtic Gallic settlements, which were in many ways already integrated into the Roman trade network in the case of southern Gaul.[citation needed]