Adywan, I have a small suggestion for a dialogue tweak. In the throne room sequence the Emperor delivers the line “An entire legion of my best troops await them.”
Even the best can be defeated by locals, using home field advantage and good tactics, even against overwhelming numbers.
Just think of Thermopylae, or the Battle of Myeongnyang.
The persian Immortals were one of the best trained elit warriors at the time, and pretty sure the Japanease navy was not to be underestimated either.
And they lost. Big time.
So it can happen.