Ancient times, if in western world, CPT is leader of a company,
so so big only. But I think you refer to Ancient Chinese rite? I've
actually never seen Dui Zhang as a rank within Ancient Chinese
military, normally its just a general reference to a army leader.
The normal ranking system is Wu fu Zhang, Shi fu Zhang, Bai fu
Zhang, Qian Fu Zhang equivelant. The Ancient Ancient want uses
terms like Shi SHi, She, Da Ya, Ya Hou and stuff, so even more
unlikely to have Dui Zhang. The closest term that the the Zhong Wei
used in Qin and Han Dynasty which is written in the same way as
modern Lieutenent, but back then it is the CDF equivelant.
Do reply me if you can find a specific dynasty or era where Dui
Zhang is a recorded rank. I'm curious too.