Wuzhangyuan lies south of the Wei where the Xie valley comes out. On the last northern expedition Zhuge Liang camped here and faced Sima Yi for more than a hundred days. Sima Yi would not fight. After Zhuge Liang died, the army withdrew in secret.
The saying that a dead Zhuge routed a living Zhongda is kept in Pei’s notes. The empty fort is a different story, which Pei rejects, and it is usually told of Yangping or a western city, not as a reliable report from this camp. Wuzhangyuan is not a captured Chang’an.