It motivated them to fight back and not let them be ruled unfairly.
Hope this helps!
Personally I would keep the right to bare arms if ever you're put in danger. The right to property because, if you're like me and you'd rather be alone than have people come in and out whenever they please, you'd want privacy. The right of freedom. No slavery. That is for obvious reason. The freedom of speech and ability to identify the way you'd like to. That would be also in the pursuit of happiness because why live if you don't have a reason.
The main advantage which the Germanic tribes had in their conflict against the Roman Empire at the time during the 3rdr and 5th century was that they were very motivated to defend their own lands which were invaded by the Romans. They also knew the terrain and felt comfortable being there.