Yeah, that’s right. But just because the Battle of the Teutoburg Forest was won does not mean that the Teutons were an advanced civilization at that time. The fact is that the Roman army at that time was far from being as well equipped as it was in its heyday and that serious tactical mistakes were made. Incidentally, the battle did not even take place in the Teutoburg Forest.
The situation is similar with the Indians. Please do not confuse them. Victories of great battles does not yet say anything about the level of cultural development.