The early Tang China lists (4407-4409) have an option to upgrade their troops from Formed to Drilled from 737CE.
In the Northern Tang China and Southern Tang China lists (4407 and 4409 respectively), the list of upgraded troops include Jian Er cavalry, but the entry are listed and priced as Formed Loose, instead of Drilled Loose.
Is this correct? Jian er are an upgraded version of Tujue cavalry, who do become drilled from 737CE.
The list is in error. The Jian er should be Drilled Loose. I'll look to correct this.
Richard