Defection. Once it starts, the flood gates open as Imperial troops sent to the Frontier to die for the Emperor suddenly see a chance to survive by hopping across the border into the Green Empire. The mass civilian exodus was bad enough, but when the Emperor's own fleet starts doing so in alarming numbers only a bit of trickery on the part of the Emperor is going to lead to victory before he loses too many ships to the growing sanctuary of sanity that is the Green Empire.
Aer-ki Jyr is one of the top 20 science fiction authors on Amazon due to his extremely long and ongoing space opera epic STAR FORCE, one of the longest military science fiction series ever written.
My only complaint is the continued use of weird measures of time and distance. Please adopt things that make sense to the reader. I'm not going to try and memorize a new system of measurements, it's hard enough to have metric and standard..... Still a good story other than the weird fascination against meat eating. I guess Vitox don't have incisors.