That implies that Garlemand trained them in any way, and didn't just deal with insurrection by taking all the willing and able fighters and throwing them into the Armies to keep them under watchful eye. They could promote certain, actually capable and suffering from Stockholm Syndrome, members of the subjugated in order to KEEP them down by giving them false hope of becoming part of the greater nation. Hope is morale, morale keeps people from rebelling, rebellion is put down by burning everything and everyone down to unborn children, then salting the earth and poisoning the wells.