It is too early to be a prisoner of war, so that is clearly not what Gar counts as. But he most definitely was taken, against his will, by Dorrek's men. Men that had started conflict when they were merely supposed to scout.

"I will see to it that the men who took you are punished. But at this time, you must remain a guest of the imperial house. If it is your wish, I will see to it that you have space for yourself. It is the best I can allow. The band you wear, it is used to restrain our own criminals. It will keep you from bringing harm to my household."