C97 Tongguan

Tong Pass, one of the five tests at the border between Xiqi and Xiqi.

This was a mountain pass furthest from the Xiqi, but it was the first pass from the Shang Dynasty to the Xiqi.

The stone wall was over ten zhang tall, and there were two tall mountains in the middle of the valley. The city walls were towering and connected to two mountain ranges, making it easy to defend and attack. Now