An isolated city thousands of miles away is filled with white-haired soldiers; more than a thousand years have passed, how many people have remembered that the defenders of the Western Regions of the Tang Dynasty were once isolated. After the fall of the Hexi Corridor and the isolation from the Central Plains, they became a lone army. In the face of Tibet's continuous attacks, they held on for a full 42 years. The black-haired guys became white-haired veterans. In the end, the entire army was wiped out and no one surrendered.
