Mountain terrain repeatedly becomes a last-stand refuge

What other mountain forts or mountain positions became famous last stands?

Japanese mountain castles and the mountain fighting faced by French and American forces in Vietnam show how defensible high ground can prolong resistance.

The answer is intentionally limited to examples that came readily to mind. Japanese mountain castles gave small samurai bands places to resist until they were destroyed or achieved revenge. Mountain fighting in Vietnam also made the terrain exceptionally dangerous for French and American forces. High ground can isolate a smaller force while letting it resist long after easier terrain would have been lost.