It's important to understand that the departure of this army means a life-and-death token for the entire He Family. Once the Beijin Family detects it, they will certainly know of He Tongzhang's betrayal.
Can He Tongzhang prevent this army from going to the Imperial Capital to serve Da Qin?
The answer is also impossible.
Because He Tongzhang cannot provide evidence of absolute loyalty to Da Qin, that he won't betray.
When your subordinates' lives are controlled by others, and you can't decide their life or death, just because of one or two slogans of loyalty, can you trust them?
Human nature changes. Perhaps at this moment, He Tongzhang is loyal to Da Qin, but after a long time, cherishing life, or when his power grows stronger, he might develop other thoughts.
If Qin Hong fails to take away the fifty thousand Martial Emperor soldiers this time, He Tongzhang will also be regarded as a betrayal here by Qin Hong.
