Romans were trying to expand into that territory and the natives of the area didn't want them to.

Yes. The best known is the battle of the Teutoburg Forest in AD 9, when Germanic tribes practically wiped out three Roman legions.

The Romans were defeated by the Germans at the battle of Teutoburg Forest which was one of the biggest Roman defeats

The Romans were defeated by the Germans at the battle of Teutoburg Forest which was one of the biggest Roman defeats

about 70,000 Germanic and roman from what I know.