"Those who fight", in this case, means the military aristocracy. Compare to the three estates of the French Ancien Régime (https://en.wikipedia.org/wiki/Estat

"Those who fight", in this case, means the military aristocracy. Compare to the three estates of the French Ancien Régime (https://en.wikipedia.org/wiki/Estates_of_the_realm#Kingdom_of_France https://en.wikipedia.org/wiki/Estates_of_the_realm#Kingdom_o...). The first estate was clergy (aka, "those who prey"). The second estate was nobility, original the "nobility of the sword" (aka "those who fight"), but later including administrators and judges as the "nobility of the robe". Note that the second estate was exempt from most taxes and forced labour, which underscores their power and prestige. And then the third estate was "everyone else", basically peasants, serfs, wage labourers, etc.